Can anyone explain to me how the oil pressure is regulated on my '17 Silverado 5.3 V8? Under normal running RPMs, the oil pressure guage shows approx. 40 psi. However, when I'm going downhill with my brakes on, the Hill Decent braking comes on & it shifts the transmission down to help slow the truck down. Once the engine hits about 3500 RPMs, the oil pressure jumps to approx 60 PSI. I'm curious how this is done. I assume that there's an electronic valve that turns off the pressure bypass valve. But that would mean that the oil pump is producing the 60 PSI all the time, with a relief valve reducing it.
Can anyone explain what is actually going on inside the engine for this.