Smoking at start up

[David Hopkins]

My 2001 std 1.8k has done 2600 miles , on a couple of occassions recently at start up from cold I get clouds of smoke for a few seconds( I don't think its steam ) from the exhaust . Once I have blipped the throttle a couple of times it clears . Nothing untoward in the oil or the water .

 

Car is still under warranty , apart from taking it back to Caterham any ideas what it could be . Have recently changed the oil and used Mobil 1 0W40 , previously was using Mobil 1 15W50 . Could the oil level be a contributory factor . Its filled to the top of the yellow bit on the dipstick with the engine off and with running its on max .