I also snagged some RP 0W-20 on closeout at Walmart. My wife sent me to Walmart to pick up a couple items yesterday. So I stopped by the auto section, and found 4 qt. bottles for $3 ea. So today, when my wife had to make a trip to a neighboring town, I had her stop at Walmart and check for more. She found 2 jugs at $20.
As others have said, I've never tried RP, because I consider it to be way overpriced. But at $20, that's even cheaper than Valvoline Synpower. I'm banking on RP being at least equal to M1 EP or PP.
So, one question. My Outback takes 5 qts for an oil change. Where I got the 4 qts of RP, dare I top off with a qt of M1 or PP, to bring it up to 5 qts? There have been a number of threads here on the subject of custom blends of oils, with some of our most knowledgeable members here supporting doing so. I know they support blending different viscosity oils. But what about blending different brands of the same viscosity?