If we are talking about the same fitting - the big oil union that screws into the lower engine case - your driver side, yes, it is a crush washer - just crawled under mine to check (is on trailer). So, I would first try and verify which bit is leaking - no point pulling apart a good seal. at worst you could wipe the area down with brake kleen, and run it briefly and check to see where the drip forms - on the case, or on the union.
Regards
Alan

I had my Rob Siegel European Electrics manual ready to crack open to the alternator chapter but went for the easy stuff first; lo and behold, a loose nut on the chassis ground strap. Big roadblock for electrons. Paul swung the geardrive 13mm wrench so he could say he fixed it. I was grateful we didn't have to pull the alternator. John.

starter issue?
 

My starter ring was so chewed up it was unserviceable. We got a new flywheel starter ring from porsche. I wanted a new starter but my mechanic said the starter was a ok. After reading this thread I'm wondering if the alternator is a persistent issue on some 930s. My starter ring has now been replaced twice in and my 930 has 51,000 miles..


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I also need to replace my 12 year old optima red top battery. It's still going strong though..


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