Turning the car off right after a hard run can cause smoke on the next start up. At high rpms, a lot of oil is pumped into the upper part of the motor and the scavenger pumps can't keep up. The oil doesn't have time to drain out of the top of the engine, causing the smoke on the next start.
Next time idle it for a few minutes after a run before you shut it down. This actually helps cool the car better than just shutting it down right away.
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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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