I'm not changing the oil viscosity in my Toyota just because GM engines suck
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I wouldn’t deviate from what was spec’d in any engine with VVT. If you want to be proactive, change the recommended oil more often.I've been running 5w30 since probable 3k miles on the truck. The motor is a little quieter and smoother as you would expect. I have a hard time believing that a warranty would be denied over it. I am taking the chance. I also plan on keeping this truck for 2-300k miles, so I think the little bit of added protection could help in the higher miles. I'm pretty sure that if CAFE standards or whatever is driving the mpg regs, we would not be playing with 0w20 or thinner oils. Are they adequate in most engines? absolutely. Do I feel better going up one grade? you betcha. Would the manufacturers be pushing thin oils if not driven by mpg standards? I doubt it.