Positioned as a replacement for the 911, the 928 was a great GT car in its day. In 2023, it's a bargain too.
Note for reference: car weight and power data is hard to pin down with absolute certainty. For consistency, we use the same source for all our guides. We hope the data we use is right more often than it’s wrong. Our advice is to treat it as relative rather than definitive.Porsches have always been very well-engineered, and the 928S 4 certainly followed that example. Good maintenance is of course key to keeping any old engine together. Looked after properly, the S4’s 5.
As most of us know, electricity in engine compartments is carried by wires and these get fragile with age, heat and corrosion. This happens on 928s. It’s wise to keep sensors, ground straps and electrics generally clean and treated with water-repellent spray as appropriate. Other stuff can go wrong over time too, like the drive belt that links the 928’s dual distributors. If that belt goes west then so does your car’s smooth running. Crank seals and oil seals generally can stop sealing.
The engine thrust bearing was notorious for failing on 928 autos. Left to it, wear in this area would eventually cause the crank to grind away the crankcase, trashing the engine. Automatic transmission fluid was used for the power steering rather than power steering fluid, not sure why, but ATF is flammable and when it ran through old pressurised PAS lines in the 928 it was known to cause a fire or two when the pipes failed. Transaxles could leak.
That programme of improvement obviously stopped with the car in 1995. From then on it’s a simple case of all suspension and brake parts wearing out and you replacing them, or not, depending on how stingy you are. In any big, heavy sports car, worn dampers and bushes will noticeably impact the drive quality. Bush replacement in a 928 requires fairly heavy-duty pressing equipment. Wheel alignment is also important on these.
Any electrical switches in the cabin should be checked for correct operation. Some of them probably won’t work so you then have to work out if you’re going to proceed anyway and will probably wish you’d never tested them in the first place. You can check the climate control too but again don’t build your hopes up too much. At this stage, the electrics are probably going to give you a few headaches. Some say you should bin any 928 relay with ‘Bosch’ written on it.
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