Oil leak on 2006 Buick LaCrosse

I have an oil leak behind the upper pully for the cam shaft can you tell me what could be the cause.

Asked by for the 2006 Buick LaCrosse
1 answer 1 comment
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.
Can you tell me about how much it will cost for meto have it fixed