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Old 04-02-2007
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Assuming the oil is coming from the filter likely simply backed off the screw on fitting which can happen and is a mess when it does!
Suggest you double check your filter number again:
Yanmar part number 129150-35152 replacement Oil Filter. Old part numbers: 129150-35150 and 129150-35151.

Other than that...just reinstall a new one, lubricate the rubber gasket then screw it on by hand pretty tight but not as tight as you could make it. If this continues to happen I would suspect some deformation in the engine seat for the filter and you might be better off getting a remote oil filter ket for the engine from your Yanmar Dealer (check good luck.
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