Originally Posted By: kajunman
I use Penzoil Ultra 10W-30 in my Focus after break in. How does it compare to Royal Purple 10W-30?
Thanks in advance,
kajunman
It depends on what formula of RP you are talking about? There are 3 basic formulas being made now...
API Licensed oils( currently SN )
High Performance Street oils( HPS - similar to the old API SL forumla )
Extreme Performance Racing oils( XPR )
The XPR and HPS are more what people think of when talking about boutique oils like Redline and some of the Amsoil offerings and carry no API certifications. I would put these oils above PU for sure. The API licensed line is more of a premium name brand oil like M1, PU/PP, QS, etc... although for me personally I rank it higher than PU.
Pennzoil Ultra is a very good oil but so is RP API SN. My personal preference would be the RP but if you have been using Pennzoil Ultra and have been happy with it why swap?
One thing for is sure, you have come to the wrong place for feedback on Royal Purple if you want answers that are based on anything that isn't ridiculous from more than 1 or 2 people. 90%+ of the feedback here will be negative and from people who have never used RP. They don't like it because it is purple and because it isn't sold for $20 in 5 gal jugs at Wal-Mart so it has to be bad. You will also hear that there are tons of bad UOA's with it here but that is just untrue.
If you browse the many auto forums out there you will see RP is very highly regarded from folks who actually use it. It is treated like a redheaded stepchild here at BITOG though. For a place supposedly full of intelligent people who know oil you will get a lot of ignorant, foolish, and downright false info on RP here from the naysayers.
Expand your search out to other forums besides BITOG for feedback on RP if you want to get unbiased and factual feedback from actual users.