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I had the same thing happen in my 740 bimmer, while I had let a family member drive it for a couple of weeks. I didn't blame them for what happened but was pretty angry over the fact that they didn't tell me about it and kept driving the car. This thing sounded like a tractor at idle!
I did some research and decided to try to repair the plug threads. I rented a time-cert tool set from aircooled.net and bought some time-certs from amazon. The repair took me a couple of hours and was pretty straight forward. I put some vaseline on the tap to keep the shavings from falling into the engine, as much as possible. The plug torqued down nicely and has held fast now for 25k miles. My other option was to pull and replace the head; pretty major effort and $-wise.
I don't see any reason this wouldn't work on a flat-6. The access to the plugs is a little more difficult but I would give it a try.
Cheers, jt
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Cheers, Jt
-84 911 targa
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