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Re: Audi oil drain plug leakage, curious
Posted to Open Discussion Forum on 1/24/2019 2 Replies

My guess:

By using the grooves to lock the gasket into place against the pan the friction and wear of loosening/tightening the plug is placed on the dispensable plug and gasket rather than the expensive oil pan.

(And it's only a guess) Login to read more.

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