I was/am sale loyal, but I'm starting to become brand loyal. I like dumping all my leftovers from 5 quart jugs into one jug for a future oil change. I sleep better at night if they're all the same brand. Right now, looks like Pennzoil is getting the most of my business. We'll see if I get my rebate... If not, I may be going to Valvoline. I like their $10 coupons that pop up regularly.
If their was no price difference and no sales, probably stick with Pennzoil. I guess their GTL marketing works on me.