excessive smoking on 1990 Mercedes-Benz 420SEL

car smokes after being driven for half hour around town or up hill, car has 148,000 miles and has been resonably well maintained. It uses about 1 quart oil per 3,000 miles. Thanks.

by in Chehalis, WA on October 07, 2010
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1 answer 1 comment
ANSWER by , October 12, 2010
Worn valve guides or failed valve guide seals and piston rings worn or sticky can cause that concern. Greg
COMMENT by , November 12, 2010
Thanks-sorry to get bacxk so late