Quote:
Originally Posted by johnmyster
I'm of the opposite school of thought.
And I'm not convinced a thin oil will pump up measureably faster than a thick one. My oil pump is a positive displacement pump. It's spun by the engine. It's going to move the oil. Non-negotiable.
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The engine-driven oil pump IS a positive displacement pump. But let us look at the intake side of this positive displacement pump. Immerse this pump into a thick liquid, and things begin to appear differently...the thick stuff is not pulled as readily into the pump suction...it tends to "cavitate". This negative pressure oil is not being delivered to the mains...flow has been slowed; flow is what lubricates, not pressure. Less flow is less lubrication.And less cooling. Film strength is not pressure-related.