If you are using a quart every 500 miles you most likely have some seriously worn wrings, seriously bad valve stem seals or a blown head gasket.

Grey smoke is a sign of oil burning. White would be coolant.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....