I put the Mobil 1 20w50 in the 190e. It has 225k miles on it. Really seemed to make a difference. I think the 10w40 is fine, but anything less is just too thin, especially in S. California.

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)