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Why does my 86 chev 350 smoke oil out exaust only sometimes

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Are you sure it's oil? It could be antifreeze from a leaking head gasket. If it is oil for sure, about the only time you will get "sometimes" blue exhaust is when they are over full, or have a bad intake gasket.

Posted on Jul 14, 2010

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On a truck this old, I would say that the rings are worn, and the valves are leaking, maybe.

As it warms up the dynamics may change, with different driving and weather conditions making the system smoke or not smoke.

Posted on Jul 14, 2010

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