Kia Rio cars are quite popular in Russia. These are some of the most budget-friendly foreign cars that are available for sale with a good selection of trim levels. 1.6 Kia Rio petrol engines are installed on cars with both manual and automatic transmissions. Proper operation of a car with such an engine will allow it to travel more than 200 thousand kilometers. In this article, we will look at what the features of the 1.6 Kia Rio engine are, how long its service life is, and how to properly operate cars with such engines.

Table of contents:

Engine characteristics 1.6 Kia Rio

The Kia 1.6 car engine, which is installed on the Rio model and a number of others, is made of aluminum alloy, with the exception of steel cylinder liners. The engine, despite its small volume, has a declared power of 123 hp, which is quite enough to accelerate a car with a not very heavy body to 100 km/h in 10-11 seconds.

Engine problems 1.6 Kia Rio

The 1.6 engine is quite unpretentious to maintain, and it is practically devoid of serious common problems. Most often, repairs to the Kia Rio engine are required due to the breakdown of some individual parts, as a result of their long continuous operation or the presence of a manufacturing defect.

Among the typical problems of 1.6 engines, “floating” idle speed can be noted. This problem on Kia Rio occurred due to software. In modern car models released after 2017, this problem is solved by default. If you purchase a car from earlier years of production, and no work has been done with the ECU firmware after leaving the factory, it is possible that you may encounter a similar malfunction.

Please note: Idling may also occur due to the poor quality of the fuel used.

To minimize the likelihood of engine failure in a Kia Rio, you need to pay attention to the following points when operating it:

Engine life 1.6 Kia Rio

In books about the technical operation of the Kia Rio you can find information that the car’s engine life is 250-300 thousand kilometers, and the guaranteed service life is indicated at 200 thousand kilometers.

In fact, in urban realities, the Kia Rio 1.6 engine works without failures for 150-180 thousand kilometers. After this, it may begin to “crumble”. The fact is that the car’s dashboard does not always indicate the actual mileage for urban conditions. The car often has to sit in traffic jams, so instead of the stated 250-300 thousand, it can travel fewer kilometers.

Please note: Automatic transmissions in Kia Rio most often fail before engine problems begin. Therefore, if you want to buy a car that can drive 150-180 thousand kilometers in the city, it is better to choose models with a manual transmission.

The inexpensive Kia Rio car has established itself as a fairly reliable model, which is offered to the buyer with various engine options. Speaking about the reliability of the Kia Rio engine, it is necessary to understand that all modern engines are structurally complex and have their own service life, during which it is assumed that there will be no problems or complex breakdowns.

Correctly calculating the life of the Kia Rio engine

New Kia Rio models are equipped with Chinese engines, the service life of which, depending on the specific modification, is 150-250 thousand kilometers. Such significant discrepancies can be explained by different operating conditions of the vehicles. So, for example, when operating a car in the city, the service life of the KIA Rio engine is significantly reduced. In dense city traffic, the power unit often idles, and the engine hours invariably increase. Whereas when the car is used primarily on country roads, its reliability increases significantly.

The above figures apply mostly to new cars. If you buy a used car, the engine life of the Kia Rio will be significantly less. In this case, it all depends on the operating conditions, whether the previous owner followed the service requirements, and so on. When purchasing, it is recommended to carry out in-depth diagnostics of the engine and automatic transmission, which will determine their technical condition.

Calculating the operating time of the motor

The estimated time for a major overhaul is considered to be 300 thousand kilometers for six-cylinder engines. For four-cylinder power units that were installed on the Kia Rio, the need for major repairs may already arise after a mileage of 150-250 thousand kilometers. The smaller the engine volume, the more the driver has to spin it during acceleration.

As a result, the engine's service life is reduced, and breakdowns may occur somewhat earlier than on six-cylinder engines. Kia also produces powerful eight-cylinder engines that have a service life of a million kilometers. It should be noted that KIA installs automatic transmissions on many of its cars, which have an indicator of 200 thousand kilometers. In most cases, a simultaneous overhaul of the power unit and automatic transmission is carried out.

Is it possible to extend the life of the power unit?

In the technical documentation for your car you can find all the necessary data about the engine life of your Kia Rio. It should be said that with proper operation, trouble-free operation of the motor is possible, even if the service life of this unit is significantly exceeded. To extend the life of the engine, it is necessary not only to comply with the manufacturer’s requirements for car servicing, but also to eliminate all existing, even minimal, breakdowns. Pay due attention to the quality of the motor oil you use. It should also be, since the use of low-quality gasoline or diesel fuel can quickly damage the engine, which will require expensive repairs. In the winter season, it is recommended to shorten the service interval for oil changes. Also remember that it is not recommended to operate the car at temperatures below minus 20 degrees. During the cold season, the power unit experiences increased load, which invariably has a negative impact on reliability.

Constantly check, and if there are any problems in the operation of the cooling and lubrication system of the power unit, you must immediately contact a service station and repair the existing breakdowns. The engine life indicator is influenced by the driver's driving style. If you are used to aggressive driving, and every time you accelerate, you crank the engine to the red zone, this will invariably lead to a decrease in these indicators and serious engine damage. The calmer your driving style, the longer your car will serve you without requiring expensive repair work from the driver. Go through maintenance in a timely manner, which will also allow you to extend the life of your engine.

Reading time: 7 minutes.

Where have evolutionary processes taken the Koreans? And a few words about the new Kia Rio Gamma (G4FA) engines of 1.4 and 1.6 liters.

Evolution of the Kia Rio engine in section

Korean-made cars conquered the markets of the CIS countries a long time ago, and as practice shows, they are not going to give up their position. The new Kia Rio, which debuted in 2000, became a cult car far beyond its homeland. We can talk for a long time about the innovations that have been updated in this sedan, but in a special way I would like to note its technical characteristics. Therefore, we will not waste time.

New heart, new life

The model entered the automobile market with two types of single-row four-cylinder Gamma engine, the volumes of which are 1.4 and 1.6 liters, respectively. The first heart of the Kia Rio beats with a power of 107 hp. With. and torque -135 N/m. Another, 1.6 liters, lives at a purity of 123 liters. With. and 155 N/m of torque. Another surprising thing is that compared to previous Kia Rio engines , real Gamma engines have significantly reduced fuel consumption and emissions of harmful gases into the atmosphere. At the same time improving the average technical indicators. This means that there has been a worthy replacement for the old Alpha engine with a volume of 1.4 liters. The transmission on the new Kio Rio is represented by four types of control, two automatic and two manual:

• 6s automatic and manual;
• 5-speed manual;
• And a 4-speed automatic;

All this significantly affected the dynamic performance of the Kia Rio. Thus, a 1.4-liter engine reaches a hundred in 13.6 seconds, developing a maximum of 168 km/h at such indicators. And its brother Gamma 1.6 will be a little faster at a hundred, in 11.3 seconds. The highest speed of this trotter is 178 km/h.

How did you achieve such results?

Thanks to several design features that distinguish the new Kia Rio device, manufacturers were able to not only improve engine performance, but also introduced several fundamentally new solutions to the concept of engine building. Some of them:

• We increased the volume of the cooling jacket, which made it possible to reduce the temperature of the exhaust gases, and this is additional protection;
• Thanks to better cooling of the spark plugs, the ignition timing has been increased, which significantly saves fuel;
• The axis between the center of the cylinder and the crankshaft has been shifted by 10 mm, which reduces friction and increases durability.

But that's not all. The fact is that the design of the third generation Kia Rio engine is fundamentally different from the engines that were in the second generation cars. And comparing them, of course, is just as incorrect as comparing a good smartphone and some black and white candy bar. But how nice it is!

Let's compare the features that distinguish the Gamma engines from the old Alpha

What can I say, there were unexpectedly many of them. In principle, this is not surprising; the Chinese have always had their heads in the right direction. Let's see what they've come up with.

1. If you pay attention to the location of the manifolds, then, unlike the previous Kia Rio engine model, the Chinese decided that the intake manifold with the catalyst should be at the rear, between the engine and the engine shield. The intake valve was placed at the front and therefore the air inlet is cooler. This means its density is higher, which allows more fuel to be supplied to the cylinder and, as a result, increase power;
2. I was also pleased with the absence of a timing belt that always requires maintenance. A good replacement has taken place, now instead of it the Kia Rio has a chain drive hidden in a block, which is regulated by two hydraulic tensioners;
3. If we compare the 1.4 Alpha series engine with the 1.4 Gamma engine, then the locations of the mounted units have changed for the latter. The generator, for example, has moved upward, which reduces the risk of flooding. The air conditioning compressor is now in front, and the power steering pump is behind. In principle, the same changes are observed on Gamma 6;
4. The intake manifold is plastic, with a small box on the intake pipe - this is a resonator, it reduces intake pulsation and noise level;
5. The drive mechanism of all 16 valves was replaced - it lost hydraulic compensation, but this only benefited it. Since now there is no need to adjust the gaps between them.

In addition to all this, the operating mode of the generator has been improved. During acceleration, the power will be reduced so as not to force the engine, taking it away from it, and when braking, vice versa. To a certain extent, this even acts as protection of the engine from unnecessary overloads. At the same time, using the inertial motion of the vehicle to recharge the battery. In addition, installing a double thermostat in the cooling system will allow the engine to warm up more quickly.

How to take care of your engine

Since engine repair is usually an expensive process and, most often, once started, endless, then following a couple of simple rules will save you from unnecessary fuss. Engine protection and care is: high-quality fuel, properly selected oil and antifreeze, not water. The last thing you need to remember!

About the oil

To achieve maximum acceptable performance and adequate engine protection for your KIA RIO, select only an oil that will meet ILSAC or API requirements. Those lubricants whose viscosity coefficient does not have the proper SAE grade should not be used.

In general, KIA officially fills its engines with Hyundai OIL Bank, SK Lubricants, S-Oil oil and a couple of other lubricants. In terms of specificity, they are like twin brothers to the Ilsakov GF-3/4/5. They all have analogues of the 5w-20 brand.

Changing the oil and filter

Naturally, the first thing you need to do is drain the old oil, and to do this:

1. On the oil drain neck protection(cover), it needs to be removed;
2. Pull out the drain plug and drain the oil, but not onto the ground, but into some container.

Next, the filter is replaced:

1. Remove the oil filter;
2. Inspect and clean its mounting surface. Check for defects;
3. Make sure the new filter is identical to the one you are replacing;
4. Apply new oil to the gasket of the new filter element;
5. Once in place, twist it lightly until the new gasket contacts the seat.
6. Tighten all the way.

And finally, changing the oil:

1. Install the cleaned hole plug with a new gasket;
2. Refill with fresh engine oil. It should not be filled to a level higher than mark F.

According to the Kia Rio manuals 1.4 and 1.6, an oil change should occur almost every 7,500 km. And despite the fact that they often write things that are completely far from reality, it is better for a complete oil change to occur rather than adding it a little at a time. Well, the fact that the oil filter needs to be changed every time the oil is changed is probably known to the average service station worker.

How to protect the motor from constant temperature changes

It’s bad that Koreans don’t live and build their cars here. This is probably why car owners have to think on their own about how to protect their cars from overheating and freezing. The maximum -5° in Korea and ours - 25° are significantly different.

Of course, in both Kia Rio 1.4 and 1.6 engines the thermostats were replaced, but, unfortunately, this does not solve the problems. Even a triple thermostat is not protection from our frosts. That's why you have to warm up the car for 15 minutes every morning before starting it.

While browsing various websites and forums on automotive topics, I came across one interesting idea: a means of insulating internal combustion engines. In simple terms - a blanket for the engine. I immediately remembered the old woolen blankets that my grandfathers used to protect their little ones from freezing. But here everything is a little more solid.

It is reasonable to use such a thermal insulation product for several reasons:

• The insulation prevents freezing of the mechanism elements of the Gamma 4 and 1.6 engines, which makes it possible to start at very low temperatures;
• A car blanket is a replacement for the need to frequently warm up the car.

The latter, by the way, also simultaneously solves two problems: it also saves fuel consumption, that is protection personal wallet, and precious time.

conclusions

As you can see, there are always pros and cons, even with such good engines as Gamma 1.6 and Gamma 1.4, so only time will tell how good this replacement was in the automotive player market. Everyone has their own preferences, but I like this machine.

Engine Kia-Hyundai G4FA

Characteristics

Production	Beijing Hyundai Motor Co.
Engine make	G4FA
Years of manufacture	2006-2018
Cylinder block material	aluminum
Supply system	injector
Type	in-line
Number of cylinders	4
Valves per cylinder	4
Piston stroke, mm	75
Cylinder diameter, mm	77
Compression ratio	10.5
Engine capacity, cc	1396
Engine power, hp/rpm	100/6000 107/6300 109/6300
Torque, Nm/rpm	133/4000 135/5000 137/4200
Fuel	92+
Environmental standards	Euro 4 Euro 5
Engine weight, kg	99.5 (dry)
Fuel consumption, l/100 km (for Kia Rio) - city - track - mixed.	7.6 4.9 5.9
Oil consumption, g/1000 km	up to 600
Engine oil	0W-30 0W-40 5W-30 5W-40
How much oil is in the engine, l	3.3
Oil change carried out, km	15000 (better 7500)
Engine operating temperature, degrees.	~90
Engine life, thousand km - according to the plant - on practice	180+ 300+
Tuning, hp - potential - without loss of resource	140 140
The engine was installed	Hyundai Solaris KIA Rio KIA Ceed Hyundai i20 Hyundai i30 Hyundai ix20 KIA Venga

Malfunctions and repairs of the G4FA 1.4 l engine.

The G4FA engine belongs to the Gamma series, which was released in 2006 and replaced the outdated Alpha engines. The Gamma includes a number of engines, the most famous of which are the 1.4 liter G4FA and 1.6 liter. G4FC, assembled on one cylinder block, but we will focus on the younger representative.
The engine is based on an aluminum cylinder block with cast iron liners, in which a crankshaft with a piston stroke of 75 mm, long connecting rods, pistons with a kind of displacer and a height of 26.9 mm are installed with an offset of 10 mm.
Covering this block is an aluminum 16-valve head with two camshafts. The Solaris/Rio 1.4 engine is equipped with a variable valve timing system, but only on the intake shaft; in addition, the G4FA engine does not have hydraulic compensators, so once every 95,000 km the valve clearances need to be adjusted if the situation requires it.
Compared to older Alpha series engines, the G4FA uses a timing chain with a tensioner, which does not require maintenance throughout its official life. And indeed, in practice it is quite reliable.
A single-stage ordinary receiver is installed at the inlet, without various systems for changing the length.

In addition to the well-known Hyundai Solaris and Kia Rio cars, this engine is also installed on the Kia Cee’d II, i20 and other vehicles in a slightly derated version - by 100 hp.
Based on the G4FA motor block, a 1.6 liter Gamma series engine was developed - G4FC. Later, other similar engines appeared: G4FG, G4FD, G4FJ and L4FC.
The engine was discontinued in 2018 and is now being replaced by a 1.4-liter version from the Kappa family.

Problems and disadvantages of KIA-Hyundai G4FA engines

Many people are interested in the manufacturer of the Hyundai Solaris/Kia Rio engine, so it is produced at the Beijing Hyundai Motor Company, and the engine is Chinese, but don’t rush to shout “garbage/fall apart/junk...”, let’s take a clear look at the shortcomings and main faults of the G4FA, and then Let's conclude:

1. Knock in the Rio or Solaris engine. If your knocking noise disappears as it warms up, then most likely it is the timing chain that is noisy (in 90% of cases this is the case) and there is nothing to worry about, but if it is heard when it’s hot, then the problem may be in unadjusted valves; factory Contact the service and get them in order.
2. Noise. Sounds of a nature reminiscent of clicks, clattering, chirping, etc., this is the normal operation of the injectors and they do not know any other way.
3. Oil leaks. It doesn’t happen often, however, the valve cover gasket is not perfect and traces of oil are signs of this. Change the gasket and continue driving without problems.
4. Speeds fluctuate, uneven operation of the Rio/Solaris engine. The problem is solved by cleaning the throttle valve, if that doesn’t help, then updating it to fresh firmware.
5. Vibrations at idle. The cause of this phenomenon is a dirty throttle valve or spark plugs. We clean the damper, change the spark plugs and enjoy the pleasant operation of the engine. In case of strong vibrations, look at the engine mounts.
6. Vibrations at medium speeds. This happens at about 3000 rpm and no one knows what the reason is; official Hyundai-Kia dealers talk about the engine’s features and this is true. At these speeds, the G4FA engine comes into resonance and, thanks to the unique design of the engine mounting, all the vibrations are on your steering wheel and wherever possible. Apply the gas or release the pedal, the motor will go out of resonance and the vibrations will disappear.
7. Whistle. It’s a sore subject, the whistle appears due to weak tension in the alternator belt, change the tensioner pulley and everything disappears.
8. Eats oil. The problem applies to motors since 2011, these power plants do not have a very reliable catalyst and due to low-quality fuel (especially in the regions), it tends to fail after 50 thousand km. In the process of its demise, ceramic dust enters the cylinders and forms scoring marks in the cylinders. As a result, we have high oil consumption and the need to make major repairs to the block liner. Solution: either pour very good fuel, or knock out the catalyst.
This problem does not affect the first engines with the ram's horn exhaust manifold.

Despite the declared motor life (no less than 180 thousand km), over the years of operation, these engines have shown themselves to be very good; they have a life of at least 300 thousand km. The main thing is timely maintenance and use of good oil.

Engine number G4FA

The engine number is stamped on the cylinder block near the junction of the gearbox and flywheel.

Engine tuning Hyundai-Kia G4FA

Chip tuning G4FA

One of the fastest, easiest and cheapest ways to increase power is to recalibrate your engine. Offices promise 110-115 hp after the chip, try it as an experiment, but don’t expect significant changes. It’s better to see what smart things can be done with your motor.

G4FA 1.6

A more effective tuning option is to increase the volume of the G4FA to 1.6 liters. To pull off this scam you don't need to change the cylinder block, it is the same as on the 1.6-liter engine, the heads are the same, except for the intake camshaft.
To build the stroker you will need a G4FC 85.4mm stroke crankshaft, short G4FC connecting rods and G4FC pistons (these are recessed to reduce compression ratio). After installing all this, you need to flash the ECU. For a full G4FC conversion, add a G4FC intake camshaft.
All this will give a typical 123 hp.

To go even further and get 130+ hp, you need to install a G4FG variable geometry intake manifold. To do this, you will have to spend a little effort and money on a receiver, a VIS system control unit and a G4FG probe with a guide.
If we are talking about the G4FG, then its intake camshaft will be meaner and with certain modifications, it will fit on your engine.
To all of the above you can add a cold intake, a normal 4-2-1 spider and an exhaust on a 51 mm pipe. After tuning, all this stuff will give you about 140 hp.

KIA Ceed is built on the Hyundai-Kia J5 platform. Since 2006, the model has been equipped with CVVT gasoline engines and diesel units with a Common Rail injection system. On first-generation cars, the most common were 4-cylinder gasoline engines of 1.4 liters and 1.6 liters with a capacity of 100 and 129 hp. With. respectively.

The 1.4 liter engine with the factory marking G4FA, like its older “brother” - G4FC, has a chain drive. The cylinder block in both cases is made of aluminum, the only significant difference is the crankshaft and different piston stroke. The service life of KIA Sid G4FA and G4FC engines, according to the manufacturer, is at least 180 thousand km. In practice, these engines run smoothly for 250–300 thousand km.

The most powerful on the first-generation KIA Sid was a 2-liter, 2-liter gasoline engine. It is labeled G4GC and produces 143 hp. With. power. The cylinder block is based on cast iron. And the resource of the unit, subject to normal maintenance and operation, exceeds 300 thousand km.

The KIA Sid with a 1.6 CRDi diesel engine is considered rarer in Russia. Its block is made of cast iron, and the turbine has variable geometry. Power varies depending on the version within 122 hp. With. The main advantages of this engine are good throttle response and low consumption. But when refueling with low-grade diesel fuel, problems with the catalyst, particulate filter, and fuel system may begin.

The power units on the first generation KIA Ceed are paired with a five- or six-speed manual transmission and a four-speed automatic transmission. Reviews about the A4CF2 automatic are mostly positive; owners praise the adaptability of the transmission and smooth shifts. The box is built on the basis of a reliable Japanese analogue F4A42. But with mileages exceeding 200 thousand km, breakdowns of the valve body and solenoids may occur. The problem is aggravated by untimely replacement of oil, which becomes contaminated and overheats, clogging the channels of the hydraulic plate.

As for the mechanics with which the KIA Sid was equipped until 2012, it differs from the previously used boxes. There is a 3-axis gear drive, and thanks to the plate synchronizer, you can quickly and accurately engage the desired gears. Various models of 5-speed manual transmissions are available (M5CF3, M5CF2, M5CF1), as well as a 6-speed M6CF2, which is based on a two-shaft design with synchronized gears.

Power units KIA Sid second generation

In 2012, the Korean auto company presented the second generation KIA Sid. The 1.4 liter G4FD and 1.6 liter G4FJ engines became available to buyers. Their power is 130 and 204 hp. With. The most powerful G4FJ engine in the line is installed on the GT version. There is also a 1.6-liter GDI engine with a power of 135 horsepower, which works in conjunction with a 6-speed DCT robot.

The power units operate in conjunction with a 6-speed manual or 6-speed automatic A6GF1. This automatic transmission is quite reliable if you keep the oil clean and avoid overheating. In case of untimely maintenance, the hydraulic unit is the first to fail, namely the hydraulic plate.

When oil leaks, the solenoid valves wear out, and then the clutches. If you allow frequent slippage and drive the KIA Sid really aggressively, there will likely be problems with the differential housing on which the splines will break off. This is manifested by a characteristic crunch.

Weak points and in-place repair of KIA Ceed

Engines

The first problems with 1.4 and 1.6 liter KIA Sid engines may begin after 100 thousand km. So, with a mileage of 100–120 thousand km, the chain in the timing drive begins to stretch. If it is not replaced, serious damage may occur. Crankshaft liners and piston rings survive up to 150–170 thousand km. In some cases, an incomprehensible vibration appears at idle, which is caused by wear of the motor mounts or a software failure.

In diesel versions, which were not officially supplied to Russia, problems with the turbine appear after significant mileage. This is noticeable by the increased oil consumption, which goes up to 400 g per thousand kilometers.

The cylinder block and pistons of the G4FA, G4FC, G4FD, G4FJ engines are based on aluminum. The sleeves used are made of cast iron. The oil volume in the lubrication system is 3.3 liters. An additive is suitable for restoring these power units. It will have a comprehensive effect: it will clean aluminum surfaces from carbon deposits, promote their micro-grinding, and build up a layer of cermet on cast iron sleeves. The use of RVS Master will ultimately give the following results:

• Strengthening friction units.
• Normalization of compression.
• Reduced gasoline and oil consumption.
• Simplifying cold starts and minimizing wear at this point.

To treat a two-liter G4GC gasoline engine, a similar additive, RVS Master Engine Ga4, will be required. But the result of its use will be felt even more strongly, since the cylinder block is made of cast iron using old, time-tested technology.

If you are one of the owners of a KIA Sid with a D4FB diesel engine, we recommend using the additive to extend the service life and improve performance characteristics. This will extend the life of the friction pairs, protecting them with a dense layer of metal-ceramics. But under high loads, these same friction pairs can partially come into contact due to the instability of the oil film. Thanks to the use of an additive for the 1.6 CRDi diesel engine, it will be possible to:

• Strengthen friction units.
• Normalize compression.
• Make starting easier at sub-zero temperatures.
• Reduce fuel consumption by 7–15%.

Transmissions

In the first generation KIA Sid manual transmission, the weak point is the clutch, gears, and 3rd gear retaining ring. When worn, the gearbox becomes noisier and a crunching sound appears when shifting gears. The same automatic A4CF2 is more reliable. It rarely causes problems with runs up to 200 thousand km. On the first batches of KIA Sid in automatic transmissions, there were breakdowns of the input shaft.

But the manual and automatic six-speed gearboxes on the second-generation KIA Sid cause fewer complaints. Although there are still few examples with respectable mileage. To extend the life of manual transmissions and automatic transmissions, we recommend using oil additives. They form a dense layer of metal ceramics on worn surfaces and reduce transmission noise. Suitable for an automatic KIA Ceed, and for a manual.

Fuel system

Diesel versions of KIA Sid are sensitive to fuel quality. If you refuel with low-quality diesel fuel, the injectors, fuel pump, and EGR valve are likely to become clogged. To prevent this from happening, add . The additive will increase the cetane index by 3–5 units, reduce the amount of deposits in the combustion chamber, minimize consumption, and facilitate starting at sub-zero temperatures. After all, FuelEXx was developed specifically for the characteristics of Russian diesel fuel, taking into account the climatic characteristics of the region.

For gasoline versions of KIA Sid, FuelEXx Gazoline is suitable. The additive increases the octane rating of gasoline by 3–5 units, removes carbon deposits and varnish deposits from the walls of the combustion chamber, minimizes wear on the CPG when refueling with fuel of questionable quality, and promotes decoking of piston rings. Also, the FuelEXx additive will remove water from the fuel, which will make starting easier in the winter.