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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1579060" data-attributes="member: 29141"><p>With engine running, do you feel puffs of air coming out of that reservoir uncapped with your hand over it? Are the tailpipes exceptionally clean? Same might go for one (or more) of the piston tops if you can get a borescope in each one - one or more of those would be exceptionally clean. Might be easier/quicker to first pull all spark plugs. If one (or more) of those is exceptionally clean then you'd have your answer pretty quickly. Or maybe you're a bit lucky an only a small part of the gasket is destroyed (if so) and it's only oil and coolant mixing and combustion forces are not part of the problem. It could be as simple as an oil cooler gasket failing if the motor is equipped with one.</p></blockquote><p></p>