Oil, coolant leaks abound.
Seats, dash worn badly.
Power mirrors need to be rewired.
Sunroof leaks, and partially operable.
Poor road conditions resulted in bent tie rod end.
Shifter in need of refreshing (bushings, adjust linkage)
Seriously fast in stock form, rivaling 90% of new cars built today.
Decent fuel consumption.
Turbo boost is addictive, with intense pull at full boost- other vehicles just disappear rapidly.
Timeless good looks, that never fails to turn heads even today- I still cannot find a single bad angle to view this car at.
Handling is what you would expect from cars costing $100,000 or more.
Extremely easy to self-service.
Build quality is excellent throughout.
My experience with my 1986 Turbo was that I was down $12,000 in repairs in maintenance in 2 years. Yes, it's a great car to drive, but part of the "obsessiveness" will be in regard to the amount it costs to service a car like this.
I owned mine from 1998 until 2000 - 100,0000 miles until 126,000. They were fun - and very expensive miles.
"Extremely easy to self-service."
What service have you been performing? This car is easily one of the most complex front-engine cars from the 80's. I have come to terms with the fact that physical injury will often result from working on my 951.