Best Gasket seals don't like aftermarket cranks with coarse serrations .They tend to melt and stop sealing.
Poly seals don't like coarse serrations either. You get poly-rubber dust as the serrations grind away the seal. You don't notice until the seal starts leaking and you pull the pan for repair.
Please check your aftermarket cranks to see if the serrations are as smooth as a stocker.
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