Originally Posted By: mx5miata
Say what? I'll never pour just one brand. That's like drinking only one beer. No such thing switch and choose anytime as long as it's got all the ratings.
+1
The only benefits I see from sticking to one brand is 1) that you can buy a lot of it when it's on sale, and 2) it makes the decision easier...no longer need to spend hours reading all of the promo material, etc. Now, HM or non-HM is the big decision...
That said, I mostly use Pennzoil because it is usually on sale somewhere and nearly always has a $2/qt rebate. Valvoline rebate is limited to a few months/yr.
One more thing. The OP asked about Sunoco. It will work just fine as long as it has the necessary ratings. Their gas works, too! I dont use sunoco oil because I only ever see it at their stations for 6-7/qt. I'm willing to spend whatever is necessary, but I don't see any reason to spend that much on a particular brand.