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HUGE white cloud of smoke

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I have a UK spec 2003 996 C2.

Last weekend I topped up the oil with approx 2 litres of Mobile 1 (0W-40). The engine seemed to run better and it sounded smoother after the new oil.

Today I took the car out for its first decent run after the oil top up and on a quiet road I picked up the speed. At approx 90mph I changed from 3rd to 4th and a HUGE cloud of white smoke exploded out from the exhausts.

I immediately slowed to a stop expecting the very worst. I sight checked the engine and nothing seemed to be obviously amiss and there seemed to be no leakages. I drove the car the rest of the 3-4 miles to home slowly and nothing seemed to be wrong but the oil pressure at idle went from approx 4 down to 1 bar.

I have just started the car up again after leaving it for about 1 hour and a small cloud of white smoke came out the exhausts on ignition but normal exhaust thereafter.

Can anyone advise what might be the problem?

Many thanks

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Check the oil level first, cold engine and car on a flat floor, 2 liter is a lot (0.5 liter under lowest level) and therefore difficult to check. Remove the potential overfill ASAP.

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