Thanks for all the advice, wasn't saying I was committed to RP but was more wondering about the switch from semi to full. I think I've read too much online info! I've heard the RP is real synthetic and the cheaper ones are mixed with stuff, then I read about oil Groups and RP is a group IV which...
Hey everyone, I have purchased a 2007 Lexus RX350 with 104,000 miles on it. It has had oil changes religiously at the dealer about every 4500 miles since new(found info on lexus owners website). I believe they used Valvoline blend. I am wondering if it's okay to go with Royal Purple 5w30, want...