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I have a oil leak on my 1990 buick skylark 2.5 motor coming from the back side of the motor i replaced the oil pan gasket the sending unit what could it be and how can i find it

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I've had the same problem on other GM V6 motors. You need to have the rear main seal replaced to fix the leak. GM was notorius for oil leaks in those motors since the mid-80's and never did anything to fix the problem.

Posted on Feb 21, 2009

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