Honestly, you should probably sell the car. If you can’t do the diagnostic work yourself, throwing money at a car that is expensive to maintain and not worth much is a bad idea.
Especially given that it’s been poorly maintained. (You only get sludge if the car is poorly maintained.)
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2011.75 E90 M3 | 2006 GMC Sierra LBZ | 2004 X5 3.0i 6MT | 1995 M3 S50B32 | 1990 325is | 1989 M3 S54B32
Hers: 1996 911 Turbo | 1989 325iX
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