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Buddy has a 99 Z, and after sitting all summer, it has drained a bunch (quarter of a litre)of oil into the base of one cyl. What is the cure for this, or is it even a problem? Do these have a check valve in each line?
 

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Yes, I think this is a problem. I dont know what would cause this but I would suspect the oil pump or some valve.

I filled my oil up before summer and it is still full.
 
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