I've been using RP oil and filters for a while now with great results. But I've always used their "regular" API-licensed 5w30 stuff (
Automotive - Royal Purple).
Then it hit me - I'm way out of warranty, what do I care? Shouldn't I switch to the HPS (
Automotive - Royal Purple)?
So has anyone tried it? I'm referring specifically to the Royal Purple HPS (High Performance Street).
Thanks!