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210
Checking and refilling levels
Petrol
Petrol types
The recommended fuel types are listed on a sticker inside the
fuel tank flap.
Only unleaded petrol, corresponding to the standard DIN EN 228, may be
used for vehicles with catalytic converters (EN = "European Standard").
Fuel types are differentiated by the octane rating, e.g: 91, 95, 98 RON (RON
= "Regulation Octane Number, unit for determining the knock resistance of
petrol"). You may use petrol with a higher octane number than the one recom-
mended for your engine. However, this has no advantage in terms of fuel
consumption and engine power.
The correct fuel type for your vehicle is given in the technical table for the
engine. Section "Technical Data"
Caution
•
Petrol that follows EN 228 may be mixed with small quantities of ethanol.
However, the so-called "bioethanol fuels" available at commercial establish-
ments, e.g. with reference E50 or E85, which contain a high percentage of
ethanol, may not be used, as they will damage the fuel system.
•
Even one tankful of leaded fuel would permanently impair the efficiency
of the catalytic converter.
•
High engine speed and full throttle can damage the engine when using
petrol with an octane rating lower than the correct grade for the engine.
For the sake of the environment
Just one full tank of leaded fuel would seriously impair the efficiency of the
catalytic converter.
Petrol additives
Petrol additives improve the quality of the petrol.
The quality of the petrol influences running behaviour, performance and
service life of the engine. For this reason, you should use good quality petrol
containing additives. These additives will help to prevent corrosion, keep the
fuel system clean and prevent deposits from building up in the engine.
If good quality petrol with additives is not available or engine problems occur,
the required additives must be added during refuelling.
Diesel
Diesel*
Diesel fuel must correspond to DIN EN 590 (EN = "European standard"). It
must have a cetane number (CN) of at least 51. The cetane number indicates
the ignition quality of the diesel fuel.
Notes on refuelling ⇒ page 208.
Biodiesel*
The biodiesel fuel must comply with the DIN EN 14.214 (FAME) Standard.
•
Biodiesel is a methylester obtained from rapeseed oil.
•
DIN is the German abbreviation for "Deutsches Institut für Normung e.V.",
the German standards institute.
•
EN means European Norm.
•
FAME is the English abbreviation for "Fatty Acid Methyl Ester".
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