2006 GMC Yukon Q&A
2006 GMC Yukon Question: what would cause the oil pressure to go to 80 psi?
Oil pressure will be higher when the oil is cold and at higher RPM, and lowest when it is hot and at idle. There are two engines manufacturer only gives min spec oil hot, 6psi at 1000 RPM, 18psi @2000 RPM, 24 psi @ 4000 RPM, same spec for both engines. I would verify oil pressure with a known good mechanical gauge. - patrick mannion
As said check the oil pressure with a manual gauge. Other possibilities, bad oil sender (common), IPC problem. - dale45