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Q: Oil leak on 2006 Buick LaCrosse

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I have an oil leak behind the upper pully for the cam shaft can you tell me what could be the cause.
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Your engine uses a timing chain, there isn't a camshaft seal per say at the camshaft sprocket side of the engine. Oil seals fail over time and get brittle or the lip of the seal just wears. A build up of crankcase pressure due to a restricted PCV valve could cause seal failure but most likely just a fatigued seal or gasket is causing your leak.