2001 GMC Jimmy SLE low oil pressure problem at idle after it warms up. what could be wrong?
120, 000 km and the oil pressure only drops when its warmed up and at an idle. The pressure goes down when the temp goes up and when its running at lower rpm. It's not overheating or making any noticeable noise. my dad thinks its the oil sending unit but i doubt that because i thought a dysfunction of electronics wouldn't be so meticulous. (reliably failing)