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There are several approved, but one of the most common is the Mobil1 European 0W40 Synthetic motor oil. If it meets the MB 229.5 spec, you are more than covered.
Those don't have dipsticks if I remember correctly so put in about 7.5 quarts or about 7 liters. You can add a little more, but don't go over 8 quarts or 7.5 liters.
Mercedes uses a service schedule with the letters A-H to denote the relevent maintenance recommended.A is the basic oil service and H is the most inclusive.The intermediate letters correspond to proportional services.The service light should be reset at the completion of the service.This can be done via interface or using the controls and menus on the steering wheel.The specific format for resetting is different for different years and models.Alldata is fairly accurate for reset guidelines,but is not correct on some.Make sure to use synthetic oil in all newer MB,especially with extended oil change intervals.
-First remember to perform ALL of the procedures MB recommends at this service interval. Failure to do so may result in an unsafe condition.
-Do not use oil that hasn't been approved by MB for your vehicle unless the oil is cheap enough to justify sacrificing 90% of your engine's expected service life. This engine if fairly expensive, BTW.
-Turn the key to the on position.
-Press the buttons on the steering wheel to display the 'Basic' screen.
-Then, press the up arrow.
-Press the reset button near the left side of the instrument cluster.
The best oil for any car is 5W-30 synthetic, I personally recommend Mobile 1. 5W-30 Synthetic flows more rapidly to engine parts thereby reducing "dry start" wear. In addition, full (not part) synthetics contain fewer additives (they don't need them) than conventional oils. Conventional oil additives "burn off" rapidly (500-1000 miles) after an oil change and sludge accumulates over time as a result.
Synthetic oils use much less of these additives (5% vs 20-30%) than conventional (Dinosaur oil) so there's much less sludge to build up. Synthetic oil also has a more uniform molecule size, this extends oil longevity and reduces running temperature.
I've personally used Mobile 1 for many yeas in my cars and would recommend it although I'm quite sure that other FULL synthetics would offer similar benefits.
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