Basically nothing. The valve cover gaskets started leaking oil on the exhaust, so I replaced them at a marginal cost.
The 912 is a quite underrated car. It benefits from the classic lines of the 911-series body, but is not hampered by the bulk of the six-cylindred engine. A standard ´69 912 is around 100 kgs lighter than a similar year 911. With 90 horses on tap from engine of the latest generation Porsche 356 for a 950 kg car it is not as slow as one might think. The sound from the twin-carbed 1600 ccm engine is actually enjoyable, especially with a louder exhaust.
I do a lot of track driving in various cars, and I've found, that the handling of the 912 is very good and predictable. If you push it too far in a corner it will just understeer gently. The mythical 911-oversteer will only occur if you use weight transfer (feint) before the corner. Even under heavy drifting it is easily controllable.
The non-servo all round disc brakes are very good with plenty of pedal feel. And speaking of pedals - those Porsche-engineers knew what they were doing, the pedals are correctly set up for heel and toe-driving.
But what sets it apart is the quality and feedback of the non servoed steering. If the tires are properly inflated the car will tell you exactly what you need to know. A great car!
Bet they weren't too fast with the 4 cylinder engine. Wasn't it the engine from the 356?
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