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I have a Nissan VK45DE engine with some oil consumption issues that I think are leaking valve seals.

What harm will come to an engine if used long term with leaking valve seals other than the increase in oil consumption?

  • Eventually it will destroy the catalytic converter and possibly the 02 sensors, not cheap. – Moab Feb 11 at 0:18
  • Well, cats already fell out, so it looks like that already happen, how does it damage the O2 sensors?, – Rob Feb 11 at 0:29
  • excessive carbon deposits on the sensor – Moab Feb 11 at 20:23
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If you mean the seals on the valve stems, basically the only factor is burning oil. I had a 1994 GMC Sonoma with the Vortec V 6 engine. Cheap rubber "O" rings on the valve stems failed at 50 K miles . I sold the truck when it had about 100 K miles and I know the subsequent owner drove many more miles without replacing the valve seals. Oil consumption was not much , but there was a big puff of blue smoke on each start caused by the oil that ran down the stems when the engine was off.

  • Ok, I don't have oil smoke at start unless I have been pushing hard and high rpm engine braking then stopping the engine and leaving it for a couple of hours. And smoke when I back off the throttle after accelerating hard (like at a strip) – Rob Feb 10 at 22:07

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