Originally Posted By: JAG
My firewall is blocking Quattro Pete's link so it may already contain what I'm going to post. In this thread,
Link , the following is posted:
Quote:
[snip]
As a precautionary measure and in an effort to better protect Mercedes-Benz engines from the potential long term effects of the increased use of ethanol., DCAG has decided to differentiate the engine oils that are used for Gasoline and Diesel engines.
As such, Mercedes-Benz 229.5 0W40 engine oil must be used for all gasoline engines including AMG. Mercedes-Benz recommends the use of Mobil 1 0W40 for all gasoline engines including AMG, with the exception of the SLR. 0W40 engine oil is more effective in resisting the possible corrosive effects of acidic moisture that can be caused by the increased use of ethanol. The SLR requires specification 229.3, Mobil 1 5W50 oil. To maintain the integrity of the Diesel Particulate Filter (DPF), specification 229.51 must be used for Diesel engines.
Excellent. Thanks!
Originally Posted By: JAG
I don't think ethanol produces more acidic by-products. I think more water content builds up in the oil from it. Water in oil enables acids to dissolve better in it. Acids corrode metals, obviously.
That makes sense, and jives with the wording of the above statement from MB.
Originally Posted By: JAG
Mobil 1 Formula M 5W-40 is now made and it meets MB 229.5. I've read online that this is what's used from bulk tanks at MB dealerships for MB gassers, except the SLR. The same sources said this started after the above quote was sent out.
Everything I'm reading indicates that ESP Formula M 5w-40 is a 229.51 oil. Where did you see 229.5?