I’m desperately looking for any insights on why my 996 continues to smoke and continues to use oil while on track, but no smoke or oil consumption off track, after replacing the AOS for the second time.
First lap at CTMP coming out of 5B big cloud of oil smoke, after 5 laps pulled off, oil was down 400ml.
Next 2 startups there was clouds of oil smoke.
The rest of the drive home, and since no issues.
I drive the car year round, drive it aggressively and it never smokes or uses any oil while driving it on the street.
I see other 996s on this the track with no smoke issues so I know it must be something with my car.
Any help would be greatly appreciated. Please feel free to call, email.. drop by.
289 260 8525
I am no mechanic, but a couple of observations. When you are braking for 5A and downshifting, your engine is on overrun from high revs, so any wear in your rings or valve guides will suck oil into the combustion chambers. Then when you get back on the throttle after 5B the oil is burned out causing the smoke.
Probably on the street, you are not using such high revs and therefore the problem does not materialize. Either way, I would consult a specialist as that kind of oil usage is certainly not normal. A Compression and Leakdown test should indicate any abnormal piston ring or valve guide wear.