Hi everybody. I have an 06 Envoy Denali, with the 5.3. Everything works fine, no troubles at all. This morning the girlfriend was taking it to work and the low oil pressure light came on, and then the stop engine light. So, she drove it the short distance back home, said she heard no knocking or funny sounds. The oil is about 1/2 a quart low, no where enough to make that happen. Im thinking the the oil pressure sending unit/switch is going out. Any body have any other ideas? Or thoughts? By the way, it has 75,000 miles on it. Thanks everybody.