Zage Turbo Kit Install - Toyota Yaris

[cdydjded]

Originally Posted by cali yaris

^ You are saying that rpm alone accounts for cold start 82 psi and warm idle 20 psi or less?

Yes, oil pressure with cold oil will always be higher than with hot oil. Oil thins out as its temperature rises. Thats where the for example 5W30 # come from. Multi viscosity oils work like this: Polymers are added to a light base (5W, 10W, 20W), which prevent the oil from thinning as much as it warms up. At cold temperatures the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C the oil has thinned only as much as the higher viscosity number indicates.

And depending on the quality/brand of the oil you will have +/- oil pressure.