Hey all, I just got a new GMC Z71 with the 5.3. I get my oil changed at the dealer. Was using Chevron Supreme 10w30, but they don't carry it anymore. They do carry Havoline 10w30 and Pennzoil 10w30. I was curious to which one is "better". Is Havoline pretty close to the Chevron or is Pennzoil the better oil, because in stores it costs more. Or should I just do my best to find some more Chevron? I loved the Chevron and hate they got rid of it due to supply problems. Any advice would be appreciated.