How to determine if your motor is an oil burner?
#1
How to determine if your motor is an oil burner?
In this case, we are talking about an used car inspection so the benefit of watching the oil level over the course of weeks etc.. isn't an option.
We are actually looking at an early 2003 M45 which seemed to have the same problem.
What have you guys determined as a good way to determine if a particular car is an oil burner within the limitations of an inspection?
Do oil burners show low compression accross the board? Or would a leak down test be able to detect an oil burner motor?
Thanks
We are actually looking at an early 2003 M45 which seemed to have the same problem.
What have you guys determined as a good way to determine if a particular car is an oil burner within the limitations of an inspection?
Do oil burners show low compression accross the board? Or would a leak down test be able to detect an oil burner motor?
Thanks
#4
Registered User
I think very few people will knowingly let you take their Z to your mechanic to do a compression test on their engine during a pre-buy inspection. There's just too much disassembly involved to let anyone other than their own trusted mechanic do the job.
Last edited by winchman; 05-25-2010 at 10:24 PM.
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#10
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I don't know where the "oil-burning" engines get their oil. It might be coming past the rings at some specific part of the stroke, throughout the stroke, or through the valve guides.
If it's coming past the rings, it might show up on a running compression test where the pressure is measured at the spark plug as the engine is turned over. It might not show up on a static compression test where each piston is cranked to TDC, and a differential pressure gauge is used to measure leakage past the rings and valves.
If it's coming past the valve guides, a compression test wouldn't show it.
If it's coming past the rings, it might show up on a running compression test where the pressure is measured at the spark plug as the engine is turned over. It might not show up on a static compression test where each piston is cranked to TDC, and a differential pressure gauge is used to measure leakage past the rings and valves.
If it's coming past the valve guides, a compression test wouldn't show it.
#12
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But, I think, according to Infiniti/Nissan dealers, the only approved way to determine oil consumption is through testing oil levels over a period of time.
#13
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Try searching "revup" ( late '05-06 ) some of them had oil consumption issues. Read a thread on the other site in the OZ section. Nissan Australia did a test ( sealed up the engine ) found it was using and replaced the long motor.
Last edited by pez1111; 05-26-2010 at 10:42 PM.
#14
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easy way to tell is to test drive it and get on it... If it blows black smoke guess what, oil is being leaked somewhere... If it doesn't and you buy it, then you broke and let the tear down begin.
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On the compression test, you really don't want to see any more than a 15psi spread across the cylinders. But leakage from a number of places could cause a bad compression test ( bad valves, rings etc. ) best to do a cylinder leak down test if your compression test reveals sub-par results.
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