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Bought a 87 911 at 87000 mi that I knew needed a valve job (high oil consumption) which was performed by reputable shop. Work included new valve guides, exhaust valves, etc. Car exercised weekly at all speeds / conditions and put on dyno after 6 mos later when it pulled anticipated BHP and torque. Now, (3yrs and 7000 miles later) it began running cumulatively more and more poorly. Diagnosis including a cylinder leakdown test and borescope review, found 5 cylinders have above 80+% leakage from exhaust valves and a very high carbon buildup on intake, exhaust valves and in combustion chambers. Two unrelated shops have diagnosed by leakdown tests with same results. Logically, it will need teardown to determine cause of problem. All thoughts and comments are appreciated particularly considering the short time since the valve job.
This is probably to late an answer for you but it's very important. DO NOT even consider buying one unless in addition to the pre-purchase inspection by an experienced Porsche mechanic you get cylinder balance test. That's test is good but dealers have a scope they can insert into the spark plug hole and see the condition of the valves, combustion chamber and piston tops and cylinder walls. Its VERY IMPORTANT to do this for your peace of mind and wallet.
Recently purchased a 1987 911 Carrera with 87K miles and it checked out great except the following bothers me after taking delivery. The oil level gauge runs right where it should when idling on a flat surface at operating temp, BUT when on a level highway at normal speeds the needle pretty much stays in the red zone. What bothers me is that the Owners Manual says 'Never let the needle reach the red range of the dial'. Checking the oil level with the dipstick shows no problem and the oil pressure gauge reads steady and appropriate for the RPM's. I'm thinking that at speed the gauge sending unit in the oil tank has insufficient oil available to be read. Maybe just a bad gauge but it reads OK at idle. Hopefully, oil pickup from the tank going to the sump is not being starved (although if so I would think oil pressure would fall). Obviously, I don't want to have a problem growing into a monster over time. I would appreciate all input from anyone who might shed some light on this issue for me?? Thanks to all in advance!