Oil leaks.
Torque tube bearings.
Cruise control module.
Rear hatch remote latch.
There is no other car available with this level of refinement, engineering, performance and sheer driving enjoyment for the price. The car was over $50,000 new in '85, I bought it for $12,500.
One very important thing to keep in mind is that regular maintenance must be followed as they are very sophisticated (complex) cars, and if given regular attention by a QUALIFIED TECHNICIAN they will provide many years of unparalleled enjoyment. Find someone who has experience with this model, have the car checked before you buy.
Parts are extremely expensive, insurance is twice that of the same year Corvette.
Sometime in the future I will buy a newer one.
It's worth spending more up front for a nicer car. You can spend $5000 in a heartbeat on basic repairs. But cars that have been maintained should give no troubles. Try to buy '87 or newer.
I own a 1984 928s. I was able to purchase collectors
insurance through Haggerty Insurance, $325.00 a year.