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I had good results by replacing the 3 (4?) bolts along the lower cam cover. I took them out one at a time, thoroughly cleaned the threads going into the head by chasing them gently with a tap, flushing with brake cleaner, then installing the new, micro encapsulated bolTs from the dealer with a good goober of sealant. Don't over torque the bolts!
It's hasn't completely solved the leak, but it went from a persisten drip to a drop of oil every now and then.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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