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strange noise from turbo? 900 1993

I have a 1993 945T with 95K. Recently it has begun making a new noise. After accelerating hard, when I let off of the gas pedal, it makes a noise that sounds a bit like a loud exhale. Somewhat of a metallic hissing sound, which seems to be comming from the engine. I am using synthetic oil, and switched by changing twice in the last 4000 miles. The oil looks somewhat brown, but otherwise OK. I have noticed that the oil pressure light stays on for about 2 seconds after the car starts.

Thank you,
Steve

--
1986 745 w/ M46 200K since new, 1995 965 104K






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