| [GMCnet] Tid Bits: Oil consumption. It's all in how/where it's consumed. [message #336450] |
Mon, 27 August 2018 21:53  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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6 years ago. I knew someone that got very upset that their engine consumed one qt every 300 miles. So we looked at the spark plugs. All the spark plugs showed about the same as to discoloration/deposits. The compression test came in at reasonable numbers. At 115 to 123 psi. Not great. But not bad. Inspection camera showed oil washing around the edges of the pistons. All washing on all pistons was about the same width. Again. Not a great sign. But not bad. Just expected. Put a dial indicating micromotor to the top of each rocker arm. Just looking for consistency between all the intake. Then all the exhaust. Looked good. But that test doesn't show how much the lifters are dished. Or how much of the cam lobes are gone. Again used the inspection camera to check the cam gear/chain. Had been changed at some past point. Warm oil pressures were13psi at idle. 21psi at speed. This is a candidate for a high volume oil pump. But the pump could over load the piston oil control rings. That are already over loaded. Thus it could up oil consumption. I suggested running it as is. And run a heavier oil. He's been using 20W50 oil. Still running well. Oil consumption has been at about 400 miles per qt. If the engine had all the oil consumption issues in just one or two cylinders. That's time for a rebuild. As for what's best for you. Not my monkeys. Not my circus. Bob Dunahugh
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