On spin on filter question

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I had the IMS Guardian installed at an independent Porsche shop several years ago. I noticed an oil leak as soon as I got the car home. Re-torqued the drain plug and the leak remained. In searching the internet I discovered this was a common problem.

I also found a post by Jake Raby where he indicated if the drain plug is over torqued it could stretch the threads on the sump plate thus causing the leak. I thought he was blowing smoke; however, I recently replaced the sump plate after installing an EBS baffle and now the leak is gone.

The shop that installed the system must have over torqued the drain plug right from the jump.