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I had an oil leak recently with a crush washer that I did not put on right...it was "off center" and this caused the leak although it was torqued to spec. (25ftlbs), so I torqued it some more and drove it some more but still the leak (couldn't see that the crush washer was off center at the time due to the bolt blocking my view. Finally, last Sat. I drained the oil (only had replaced oil a week earlier) and changed the crush washer and refilled the sump with the oil I had drained (hate to waste good, expensive synthetic oil) and now I have no more leak. On this last torquing, I didn't measure how tight I went with the plug. Instead, I just made sure the washer was on there straight (holding it up with my fingers as I turned the bolt), tightened until the washer was curshed and then gave it a wee bit more.
Really, on these 850's avoid the copper washer. They are too strong and having to crush it go get a good seal will mess your threads up after awhile. The oil pan and its threads are aluminum so it doesn't take much to mess them up. Torquing an already crushed alum. washer is not good either in my opinion. If it seals good again after it's been crushed once, you are lucky. Buy a handful of alum. crush washers, either from the dealer or from www.fcpgroton.com. They're cheap and will keep you from this head ache if nothing else. Buy some Mann filters from them while you're at it too. They are much better for your car than what you've been buying at Wally or K-world.
Last of all, I hope I responded to your actual problem and it's not an oil pan gasket, even though the gasket sounds like it could be the culprit due to the oil on the oil pan threads.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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