Engine can be easy or hard on oil??

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Jun 13, 2004
SF Bay Area
I read a lot of people saying that a certain engine is hard on oil and some other engines are easy on oil. What does it mean? And how to determine if an engine is easy or hard on oil? High rev engines are harder on oil in general? And vice verse? Thanks guys!
Certain engines can be harder on oil, due to operating temps, shear forces caused by gear driven camshafts or valvespring pressure etc, amount of fuel consumed (combustion products deposited in oil), oil capacity, and countless other factors.
Also add in the higher the rpm, the harder the oil works and the higher output per ci/liter will also stress the oil. When you start getting over 2 hp/ci, oil takes a beating. Dan
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