Gas engine
Your engine must use standard grade unleaded gasoline with a minimum octane rating of 87 AKI (CLC) or RON (ROS).
For optimal performance with 134 hp (16V) under high loads it is recommended to use unleaded gasoline with a minimum octane rating of 91 AKI (CLC) or 95ROW (ROZ).
Do not use fuel with an octane rating lower than 87 AKI or 91 RON.
Do not use leaded gasoline.
The use of leaded gasoline will completely destroy the catalytic converter and its exhaust emission control capability (exhaust) gases. Unleaded gasoline is used throughout the continental United States, Canada and most European countries.
Octane number
The octane number indicates the ability of gasoline to resist "knock" engine, associated with early ignition of the fuel and its detonation combustion. Therefore, it is very important to buy gasoline of the required grade in order to avoid possible engine failure and decrease in its performance.
The recommended octane rating for your engine is located on the label on the inside of the fuel filler flap. This number can be determined by AKI (CLC) or RON (ROS)
Gas stations usually sell gasoline with an AKI or CLC octane rating, which is calculated as follows:
RON (research octane number) + MON (engine octane number), divided by 2. AKI
According to this calculation, gasoline has the following octane numbers
- Premium gasoline 91-96 AKI
- Gasoline standard 87-90 AKI
Using gasoline containing alcohol or TMBE (trimethylbutyl ether)
You can use unleaded gasoline with alcohol or TMBE (refers to oxigmata), if such a fuel mixture meets the following requirements:
A mixture of gasoline and methanol (wood alcohol or methyl alcohol):
- The anti-knock resistance index must be 87 or higher.
- The mixture should contain no more than 3% methanol.
- The mixture must contain more than 2% CO solvents.
Note: Fuels containing methanol that do not meet the above requirements can be corrosive and cause damage to plastic and rubber components in the fuel system.
Mixture of gasoline with ethanol (ethyl alcohol):
- The anti-knock resistance index must be 87 or higher.
- The mixture should contain no more than 10% ethanol.
Mixture of gasoline with TMBE
- The anti-knock resistance index must be 87 or higher.
- The mixture should contain no more than 15% TMBE.
General remarks
Do not use fuels that do not meet the requirements above.
Do not use fuel with an unknown percentage of its constituents.
Use of fuel that does not meet the requirements and warranty conditions described above for a new vehicle or emission control system may result in damage to the fuel system.
In the event of increased fuel consumption or deterioration in overall vehicle handling characteristics after using one of the above mixtures, it is recommended that you switch to pure gasoline and additives.
If you are unable to determine if the fuel mixture meets the above specifications, contact a service station for assistance.
Seasonal gasoline
Many brands of gasoline are supplemented with additional additives for optimal engine performance in winter or summer. During the off-season, it is recommended to refuel the car at gas stations where the changeover to the fuel corresponding to a particular season is carried out on time.
Additives for gasoline
A major problem among many automakers is the formation of carbon deposits depending on the type of gasoline used. Although different brands of gasoline differ from each other, they share one common phenomenon - the accumulation of carbon ratios (soot) on major engine components, especially fuel injectors and intake valves. Although most brands of gasoline include additives that prevent contamination of the engine and fuel system components, their effectiveness varies.
When used for an extended period of time, various | grades of fuel that do not meet technical requirements, engine performance deteriorates. Formation of carbonaceous deposits (soot), similar to those shown in the figure, can lead to the following:
- Unstable operation of the engine at idle.
- Uncontrolled fluctuation in engine speed.
- Misfire.
- Loss of power.
- Engine operation with the ignition off.
- Engine knock or knock. If these deviations are observed for a long time, this can lead to engine failure.
- The Volkswagen Service Warranty does not cover an engine that is damaged or unstable as a result of the use of poor quality fuel.
Recent developments of new fuel grades
Gasoline manufacturers strongly recommend so-called detergent additives. Most of them are designed to prevent the formation of carbon deposits on fuel injectors. However, not all of them are equally effective.
However, some types of gasoline have been commercialized with the appropriate additives to prevent the formation of carbon deposits on injectors and intake valves.
To ensure long engine life, use only those grades of gasoline that include the above additives.
Diesel engine. Diesel fuel No. 2
In Jetta vehicles, the diesel engine is designed to run on diesel fuel only. Therefore, never use heating oil or gasoline to avoid damage to the fuel injector system and the engine itself.
If diesel fuel gets on any part of the rubber hose, it must be wiped off immediately and then washed with warm soapy water. Do not allow diesel fuel to come into contact with the connecting hoses to avoid leaks and subsequent serious engine damage.
Winter work
At temperatures below -7°C, diesel fuel 2 loses its fluidity associated with waxing, which can lead to clogging of the fuel filter or fuel tank strainer and, as a result, the inability to start the engine.
To prevent this, the fuel filter in the car is automatically preheated, which allows diesel fuel 2 to be used down to -24°C.
If you are likely to drive in temperatures below -15°C, contact your dealer to determine whether the available fuel can be used in winter conditions.
Attention: Do not use liquids that make it easier to start the engine. They can be potentially explosive and cause engine overrun conditions. This can cause severe engine damage and personal injury. Do not use antifreeze that is used on gasoline engines.
If diesel fuel intended for use in winter conditions has thickened to such an extent that it does not start the engine, it is necessary to leave the car for a while in a heated room.
This is normal if the engine noise level during warm-up in winter is higher than usual. After the engine is started, blue-white smoke may come out of the exhaust system during warm-up. This is also a common occurrence, with the amount of smoke depending on the outside temperature.
Do not unnecessarily idle a diesel engine after a cold start. Driving the vehicle slowly after starting the engine will shorten the time required to warm it up.
Gasoline instead of diesel fuel
Your diesel engine can use diesel fuel blended with 30% standard grade leaded or unleaded gasoline. If the concentration of gasoline in the fuel tank exceeds this value, the engine must not be started to avoid damaging it. In this case, it is necessary to remove the fuel from the tank, observing all precautions. See also the information above.
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