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Robust yes but bullet proof no. Any engine can be abused to failure. Improper or no maintenance can lead to failures. Given proper maintenance these engines can last a very long time. I bought a poor running 911 and found burnt exhaust valves ready to self destruct. Turns out that apparently the PO had tightened up the valve adjustment thus not allowing the valves to close completely. This was evidenced by the cam lobes being shiny all the way around. An example of poor maintenance practices leading to problems. Generally pretty tough engines.
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gary
70T coupe forever almost done
88 Carrera Targa diamond blue
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