what viscosity oil for 03 s55 and how many quarts
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I do not believe this is correct, the 5w-40 is 229.51 rated for the Bluetec models. 0w-40 is 229.5, which is the best choice for a gasoline car.
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E63 P30, CL500 Sport
It used to be 5W-40, but now Mercedes has moved to 0W-40 due to more strict rules to reduce ZDDP in motor oil in order to protect the catalytic converter.
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2007 E63 w/P30 and Eurotech CF Diffuser
Not unless you want to void your warrantee. If you do not have one, use anything you want. 10W-30 Mobil1 would probably be ok. I would stick to the 0W-40.
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2004 S55 ///AMG, 2007 E350
10W-30 wouldn't void the warranty, in fact if you look in your MB manual, depending on temps there is wide range of acceptable viscocities recommended. I do agree 0-40 is probably the most widely used. He/she doesn't say where he is so hard to tell if he needs a higher winter viscocity or not.
Use Mobil 1 or others MB recommends.
Use Mobil 1 or others MB recommends.