2001 SAAB 9-5

Engine Mechanical problem
2001 Saab 9-5 6 cyl Two Wheel Drive Automatic 161000 miles

I just noiticed white and occassionally brown smoke coming from my exhaust. This happens mostly when I decellarate. Can this be the turbo and if so how do you advise fixing it? Rebuilt, new, not at all.
The car is in very good shape( body, brakes new, recent top end timing belt)
Thank you for your assistance,
Mike Conn
September 1, 2008.

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