Originally Posted By: Clevy
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This nonsense that a 0w-xx will pump faster at start up seems to get said often however because oil pumps are positive displacement it doesn't matter if you've got a 0w-20 or a straight 60 grade in the sump because the oil pump will push the same volume of oil either way.
How many times are we going to fight this one out? A viscous fluid is going to flow slower through a network than a less viscous fluid at equal pressures. You might have to go to 1000 psi on a very thick oil to get the same flow rate of a very thin one. It ain't going to happen. The relief simply opens at the pump to prevent a shaft twist off.
Get it out of your head. Or is something else here very thick?
I'm really disappointed in you guys. Especially the more learned members. C- grades all around.
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This nonsense that a 0w-xx will pump faster at start up seems to get said often however because oil pumps are positive displacement it doesn't matter if you've got a 0w-20 or a straight 60 grade in the sump because the oil pump will push the same volume of oil either way.
How many times are we going to fight this one out? A viscous fluid is going to flow slower through a network than a less viscous fluid at equal pressures. You might have to go to 1000 psi on a very thick oil to get the same flow rate of a very thin one. It ain't going to happen. The relief simply opens at the pump to prevent a shaft twist off.
Get it out of your head. Or is something else here very thick?
I'm really disappointed in you guys. Especially the more learned members. C- grades all around.