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Originally posted by steve hutson
Why is 0W-40 too thin for diesels? Two of the dealers here in the Dallas area use it for their oil service and it is Mobil1.
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Dealers don't always use what is best for the car. They use what is most convenient and cost effective for the
dealer. I first became aware of that though Chris Ecklund, another member of this board, when our E300s were new. His dealer repeatedly used the wrong oil and Mercedes-Benz threatened to void his warranty (or maybe they did) because an improper oil was used.
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btw, I've got a 99E300turbodiesel, and 0W-40 is what Pk. Place has been recommending.
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There is no better proof of my statement than this. A 1999 E300 requires engine oil with a minimum CG-4 rating and no Mobil-1 oil carries that rating.
As for the 0W being too thin, that has been written about by others on this board with much more oil knowledge than me. So you'll have to search the archives for a more definitive answer.