2011 Mercedes SLK-Class Owner's Manual - Page 306

171_AKB; 3; 60, en-US d2ureepe, 2009-05-11T16:00:23+02:00 - Seite 304 Version: 2.11.8.1 304 Fuels, coolants, lubricants, etc. of these oxygenates to gasoline does not exceed 10%; MTBE must not exceed 15%. The ratio of methanol to gasoline must not exceed 3% plus additional cosolvents. Using mixtures of ethanol and methanol is not allowed. Gasohol, which contains 10% ethanol and 90% unleaded gasoline, can be used. These blends must also meet all other fuel requirements, such as resistance to spark knock, boiling range, vapor pressure, etc. ! Damage or malfunction resulting from poor fuel quality or from blending additional fuel additives other than those tested and approved by us for use on Mercedes-Benz vehicles are not covered by the MercedesBenz Limited Warranty or by any pre-owned or Extended Limited Warranties. Coolants The engine coolant is a mixture of water and anticorrosion/antifreeze, which provides: RCorrosion RFreeze Gasoline additives A major concern among engine manufacturers is carbon build-up caused by gasoline. Mercedes-Benz recommends only the use of quality gasoline containing additives that prevent the build-up of carbon deposits. After an extended period of using fuels without such additives carbon deposits can build up, especially on the intake valves and in the combustion area, leading to engine performance problems such as: RWarm-up RUnstable protection protection Technical data RBoiling protection (by increasing the boiling point) The cooling system was filled at the factory with a coolant providing freeze protection to approximately -35‡ (-37†) and corrosion protection. hesitation idle RKnocking/pinging RMisfire RPower loss In areas where carbon deposits may be encountered due to lack of availability of gasoline which contains these additives, the use of Mercedes-Benz approved additives is recommended. Contact an authorized Mercedes-Benz Center or visit www.mbusa.com (USA only) for a listing of approved products. Follow directions on the product label. Do not blend other fuel additives with fuel. This only results in unnecessary cost and may be harmful to the engine operation. ! Add premixed coolant solution only. Adding water and MB 325.0 Anticorrosion/ Antifreeze separately from each other, could cause engine damage not covered by the Mercedes-Benz Limited Warranty. If the antifreeze mixture is effective to -35‡ (-37†), the boiling point of the coolant in the pressurized cooling system is reached at approximately 266‡ (130†). The coolant solution must be used year round to provide the necessary corrosion protection and increase boil-over protection. Refer to the Maintenance Booklet for replacement interval. Coolant system design and coolant used determine the replacement interval. The replacement interval published in the Maintenance Booklet is only applicable if MB 325.0 Anticorrosion/Antifreeze solution or other Mercedes-Benz approved products of equal specification are used to renew the coolant concentration or bring it back up to the proper level.