Hello everyone I'm new to this forum and thanks for such a complete and specific analysis of st oil
I use st 5w30 since the mid 90"s in my fleet of GM trucks. 5000km oil change and never had any oil related problems, some of these trucks were driven really rough by employees and did very high mileage. Had various engines from a 2.2 liter 2.5, 4.3, 4.8, 5.0 ,5.3, 5.7 one of them in particular a 99 Silverado with a 4.8 is still on the road with 670,000 km +- 400,000 miles on it and beaten to death every day by a landscaping guy to who I sold it 4 years ago. He lives near my place and I often see my old truck towing overloaded trailers driven by people who have only two speeds: either stop or full throttle. Worse than that, he came and ask me how do you turn that bell off? He was talking about the oil life monitor message, I settled it at 100% again and told him you have to change your oil now! He said, yeah sure! This truck was sold at 340,000 km means I know for sure half of its life was on st oil from wal-mart. This is a test and a true one. My own personal truck is now a 2010 silverado crewcab 4x4 with the indestructible 4.8 liter.