Quote:
Originally Posted by Wigert
I seem to gave missed a digit, My Z has 77000 miles. What is considered high mile for a Z?
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77000 is generally not that high but does make this condition more likely. Rings will definitely be seated with that mileage and more likely not your issue. The higher the miles the more heat and vibration cycles the engine has endured. Add to that age and things like loosening bolts, hardening gaskets and brittle plastic happens.
Pull your plugs and try to identify which cylinders are most affected. A compression and leak down test will tell you if rings or valve guides are a problem. At idle remove the oil fill cap and check for air blowing out of the cam cover, there should be none. Blowing air indicates a ring problem. Check the pcv system for functionality. Run the car with the PCV system open to atmosphere for the same time you have experienced the oil consumption. (Cap the vacuum line to the plenum) If oil consumption stops, this will tell you if oil is being sucked through the PCV system. If all this comes up negative your are left with only three other possibilities. Oil ring collapse, head gasket failure (although that usually manifests in others ways too) and my issue of IH gasket failure. This is where I made my error. I jumped to the oil ring collapse conclusion and never checked IH gaskets first.
Having said all that it is my understanding that some engines simply don’t like to be at full oil level. They consume the first quart and then stabilize at one quart low burning no more oil. Apparently a windage issue but not harmful. Try letting the engine get a quart low and see if it stops there.
There are more exotic possibilities but they generally require a tear down anyway. Follow the basics above and it will take you to the source of the problem.
H
