Mines leaking too, but it's been on awhile and likely needs changing.

These things are sensitive to over-tightening.

I'll throw in my 2 cents.

I have never had any luck with the pan gasket sold by internet service providers.

To solve this problem, I've used dealer purchased pan gasket and filter. I realize the filter has nothing to do with the leak, but for me it would make no sense to buy one part here and another part there.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"