Albert,

Thanks for your input on this .... it is getting very interesting. Your experience with multi-grades is basically the same as mine. From the Porsche days I would either run 30 weight winter and 40 summer or run 20w-50. But in those days the only 20w-50 was for racing applications. No decent anti-corrosion additives and it always worried me in a street engine.

I think the real curve for oil considerations now are the synthetics. I think a 15w-40 synthetic may be the ideal way to go. I would probably stretch my change intervals from 5k to 7k since I do a lot of freeway driving.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)