I have three cars: 190E 2.3, 300E and a 95 E320. I'm confused about weights for the summer driving season. I've seen where a 10W-30 is fine (and helps with fuel economy) and I've also read where in the summer in N. California, the minimum weight should be a 10W-40.

I know ..... here we go ....

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)