Just searched for Mobil 1 5W50 FS, everyone wants $10 a quart, with Amazon being a bit higher. Napa is having a sale this month for $5.99 a month. Time to stock up!
It does seem to get great reviews and feedback. I've always had great results with M1.The m1 FS x2 and pennzoil euro have a higher dose of zddp than PUP (or most other current API oils) in order to meet the euro specs. I like it better for high performance use.
I have used both RP 5x30 5x40 and 10w40.Anyone here have any feedback on Royal Purple?