Royal Purple is overpriced and shears down to paint thinner.
NHSilverado said:RP PCMO's are API approved and apparently GM4718M approved, but that's the full extent of independent approvals and certifications that they carry.
Last I saw from GM, RP is nowhere to be found on the GM4718M list - not even on the conventional-level GM6094M list - at least other synthetics that claim GM4718M w/o being on the independently validated list show up as independently validated as GM6094M level performance.
At least the 15W-40 is still a PAO blend.
KieferS said:well i'm not running a 4 banger econo box either
but yes, they did go down to a 5w30. regardless, 5 HP gain or so was pretty impressive.
I have a hard time using the search feature on this site, but does anyone have any UOA or anything with RP? [/quote/]
5hp doesnt mean squat in a daily driver, and wont do much in a drag race either. Its like a K&N giving you 2hp at 5000rpms, it doesnt really matter.
NHSilverado said:RP PCMO's are API approved and apparently GM4718M approved, but that's the full extent of independent approvals and certifications that they carry.
Last I saw from GM, RP is nowhere to be found on the GM4718M list - not even on the conventional-level GM6094M list - at least other synthetics that claim GM4718M w/o being on the independently validated list show up as independently validated as GM6094M level performance.
At least the 15W-40 is still a PAO blend.
I cited that since the GM4718M is reportedly listed on their oils bottles. It may be true, since the GM4718M spec seems to be somewhat unique in that you can actually buy the paper which details the requirements and are not reliant on manufacturer testing. If that's the case, it would be possible for RP to verify the oil meets the standard without having the official GM blessing.