problem with my saab9-3 aero hot 2002.just bought it travelled 5 hours to pick it up. White smoke on initial start up,non since no cel light but seller said every now and again it comes on but oes off. Said had it to saab garage who are actually still the registered keeper,but they could find no fault. Oil was sludgy but could see no sign of water loss also has not been changed for 10000 mls.it had been stood a while. Noticed a petrol smell in car on way home whenever we stopped and not reaching full boost, only gets to end of yellow. Cel came on 20 mins into journey home.changed the oil and filter and lambda sensor as had similar probs before on previous Saab and this solved the problem. The cel went off, but on thir start up is back on again