Be careful tightening your aftermarket magnetic plug. My plug - which was with the car when I bought it five years ago - was not happy with the factory torque of 37 lbs. - The flange made a clean break from the rest of the plug.
I was using a new washer at the time.
Fortunately, I have a Porsche dealer about 30 minutes away and the parts dept had plenty of plugs in stock ( PAF-008-309-OEM )
The gentleman in parts said they start to see issues with plugs after 3 to 4 oil changes.