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A friend with a new Porsche Cayman has been changing his oil religiously after every 2 track events and taking samples for analysis. Everything in the analysis has looked good--minimal wear, low fuel %--except falling out of grade to the 100 deg. C viscosity rating of 11.0-11.3 in only 2500...

A few weeks back, my mechanic replaced the M1 that was in the car--at my request --with Castrol syntec. I asked for 5W-40 but when he went tot he auto parts store all they had was 5W-30. I have to say this has made the engine much quieter (2.7L Boxster) but after I checked out the Hot temp...