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Q: 1998 Pontiac Bonneville leaking oil

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I suspect my piston is cracked in my engine. It will start but leaks oil terribly.

An external oil leak is generally caused by a leaking seal and typically not a cracked piston, while a cracked piston is not completely uncommon, it generally doesn’t cause an oil leak unless it has come apart and popped a hole in the engine block. Have a certified mechanic, such as one from Your mechanic, verify where the leak is coming from and fix it.

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