it's shaping up for a cold winter. I'm due for a oil change on the 2002 SS. I have redline 10w30 in it now, just over 5k miles on oil and 13k on car. Due to wedding planning, I really shouldn't spend the $$ for more redline. So I was thinking of going with mobil-1. What's the difference between the 0w30, 5w30, and 10w30? I'm aware of their viscosities, but how are they made up? Is one any better, in terms of base oil I guess, than the other? Does one have more group IV in it than the other, like the 0w30? Or more PAO? I know I'm kind of throwing out oil terms here, hopefully not incorrectly. But what would be best weight, in terms of 6 month oil change intervals, usually 5-7k miles, over the winter months for this motor? Car will be driving when roads are clear, but may stay in unheated garage for 1-2 weeks at a time. And factory recommendation is, of course, 5w30.