Originally Posted by ChibiBlackSheep (Post 598678)

They switched it officially to 5w-30 in 2003.

The overall weight of the oil stays the same at 30 viscosity at temperature, I recommend 5w-30 to anyone who lives in a colder area so that the start-up oil is a touch thinner and gets around the engine quicker.

My Camaro actually says that if you live in cold areas (around -20) to switch to 0w-30 oil in the winter.

It's okay to change around the cold-start viscosity, just don't touch the warmed up one.

Originally Posted by Overkill (Post 594611)

Use a larger oil filter when possible, 4.3 Vortec for 3800, Acadia PF63 for LS4 PF48, for example