Often bad valve seals are evident with a puff of blue smoke at cold starts and when warm on sustained trailing throttle, such as coming off a freeway.

Pull a couple of sprak plugs, if you are burning oil, the plugs will tell you.

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)