I used to be a diehard Kendall guy until they sold the refinery. I bounced around between Valvoline VR1 20-50 and a few others and was not happy...The oil I was going to settle with (I don't like to settle with anything I'm not 100% with) is the Penzoil 25-50 race oil...Then I found out about Brad Penn...They are pumping oil from the old Kendall well...Now I've happily been using Brad Penn