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Update on my oil consumption. A couple weeks ago I did an oil change and filled her up with VR-1, and added some Seafoam at the same time. No metal on the either drain plugs, and I dropped the sump plate to inspect as well (first time for me.) It was clean, and no sludge or anything in the bottom of the case when wiping my finger around in there. I've since driven the car 607 miles and I'm happy to report am improvement in oil consumption. Of course being a cooler time of year, I'm not sure if this has affected this. I put 1.3 quarts in since the change, and that comes out to a bit over 400 miles to the quart. Most of that way steady highway cruising with some spirited back roads driving. Not quite as good as I was getting when I got that 686 mile/qt. back in July. My math must have been wrong. But its certainly better than the upper 200's that have been the average.
I also had a Porsche mechanic do a leakdown and compression test earlier this week. #3 was at 30% leakage, another at 16%, and the rest below 10%. Compression was 185-165 across the board. We think the leakage on #3 is getting past the rings since we could hear the hiss when removing the oil filler cap, but not through the airbox (filter removed) or exhaust. We couldn't really hear any audible leakage on the other cylinders.
So for now I'm going to simply drive the car and enjoy it while saving up for the inevitable rebuild. I think if we'd heard leakage coming from a valve on #3 I'd be a bit more paranoid, but with worn rings it's not so much of a worry, right?
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