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Don't know about 986 engines, but M97s have weak rod bolts. Under protracted runs near redline, they stretch which allows the rod bearings to slip, resulting in a spun bearing or two. Prior to my bore scoring rebuild, I always shifted at 6K rpm rather than running up to 7200 redline. Wonder if that's what's going on with your engine?
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
1987 928 S4 - Granite Green Metallic (Felsengrun)
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