Can you please elaborate more on what the difference is between regular Royal Purple and their Royal Purple XPR Racing Oil? What is the difference, is it good, bad? Also, why would they say:
"Royal Purple’s motor oils are API certified. For those seeking enhanced performance in high performance vehicles not under warranty, we recommend our XPR – Extreme Performance and Racing motor oil."
Not under warranty? why?
I use the 5w-30 Royal Purple oil and it is great stuff, need to under-go another change of oil and I thought I would check out their site to see whats new. Whats the deal with the XPR Racing oil?
"Royal Purple’s motor oils are API certified. For those seeking enhanced performance in high performance vehicles not under warranty, we recommend our XPR – Extreme Performance and Racing motor oil."
Not under warranty? why?
I use the 5w-30 Royal Purple oil and it is great stuff, need to under-go another change of oil and I thought I would check out their site to see whats new. Whats the deal with the XPR Racing oil?