I have a similar issue with my car, but I still have reverse, it just takes a about 2-3 seconds to catch and sometimes I need to gas it a bit if I want to get it moving if I'm parked at a declining position. As far as the monetary value of the car, not sure what any book says, but if that car is your only form of transportation that gets you to and from work everyday then I would think it is worth a lot more to you as ine is to me because without it I would be in trouble.

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1990 190E 3.0L