Saab Forums - Saab Enthusiast Forum - newbie needs help please

hi all, new to site and to world of saabs,
as for the above post about turbo smoking, my saab 9-5 1998 has been of the the road for about a year now and i finaly got round to changing the clutch on it (WHAT A NIGHTMARE THAT WAS) but anyway got it all done and took it for a long drive approx 60miles and the way home it started smoking and when i let off the gas and then as i reaplied it, the engine judder and hesitate as if were going to stall the engine, the smoke got worse and when i got home i checked the oil and it was dry, i put some more oil in and the smoke got even worse, so much that i could hardly see the car through the smoke, at first i thought it may be that the fuel in the tank was off do to it being sitting around for a year so i put about 10 ltrs in from an empty tank but still smoking,also the check engine light has come on, any help or advise on this would be greatfull, thanks wayne