Anyone Using Royal Purple ?
Race Director
Joined: Nov 1999
Posts: 12,952
Likes: 0
From: Greer SC
Cruise-In II Veteran
The company that built our C5R-427 recommended RP, so I use RP 10W30 on the street & 10W40 Racing Oil for the track. We did a dyno after the first oil change and the RWHP increased by 5. I am not sure that I believe that, but if you reduce friction you could get more power.
What I did was test it at the track. The Mobil 1 lost pressure when it got hot, the RP street oil held pressure much better, the RP Racing Oil did lose it at all.
Let's face it, GM recommends Mobil 1 because that's where they got their best $$$ deal. And it is probably adequate for average driving. I use RP because I am not an average driver.
What I did was test it at the track. The Mobil 1 lost pressure when it got hot, the RP street oil held pressure much better, the RP Racing Oil did lose it at all.
Let's face it, GM recommends Mobil 1 because that's where they got their best $$$ deal. And it is probably adequate for average driving. I use RP because I am not an average driver.
Last edited by Sully C5; Mar 9, 2007 at 07:40 AM.
Melting Slicks
Joined: Sep 2005
Posts: 2,625
Likes: 1
From: Rhode Island
The company that built our C5R-427 recommended RP, so I use RP 10W30 on the street & 10W40 Racing Oil for the track. We did a dyno after the first oil change and the RWHP increased by 5. I am not sure that I believe that, but if you reduce friction you could get more power.
What I did was test it at the track. The Mobil 1 lost pressure when it got hot, the RP street oil held pressure much better, the RP Racing Oil did lose it at all.
Let's face it, GM recommends Mobil 1 because that where they got their best $$$ deal. And it is probably adequate for average driving. I use RP because I am not an average driver.
What I did was test it at the track. The Mobil 1 lost pressure when it got hot, the RP street oil held pressure much better, the RP Racing Oil did lose it at all.
Let's face it, GM recommends Mobil 1 because that where they got their best $$$ deal. And it is probably adequate for average driving. I use RP because I am not an average driver.
Even after hard driving, there is no noticeable drop in oil pressure.
Le Mans Master
Joined: Sep 2004
Posts: 6,019
Likes: 566
From: Conroe Texas
i just replaced all my fluids with royal purple last month and what i have noticed is that when i shift, it seems to take more of an effort to get into gear, especially 1st. i'm thinking about adding an additive to it, like the lucas automatic additive.
Life Time NCM #2196
Joined: Sep 2004
Posts: 82,586
Likes: 1,697
From: Converse TX
I have been using the purple stuff in my boosted car for the last 6k and no issues and plenty of oil pressure under boost while out in the hill country for extended blasts even last summer when the temps approached 100 on several runs
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Instructor
Joined: Sep 2005
Posts: 222
Likes: 1
From: Brenham Texas
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
I am using it and I will continue to use it, better pressure, my car does seem to burn oil at the rate it did with MOBIL 1 and it really isn't that hard to get.
Micah
Micah
Racer
Joined: Jan 2005
Posts: 488
Likes: 2
From: Fort Lauderdale Florida
Royal Purple Customer Service
I went to the Royal Purple website and was a bit overwhelmed with all of the products available. So I sent an email to them indicating make and model of my car and I got this response within twenty minutes:
Ronnie, for your Corvette we recommend:
RP 5W30 or 10W30 Motor Oil - with XPR 5W30 for the ultimate oil.
RP Synchromax for the 6 speed.
RP MaxGear 75W90 for the rear differential
RP MaxEZ Power Steering Fluid for the power steering system
RP Purple Ice Coolant Additive added at 1 oz per quart of system capacity.
Cheers,
David
I really appreciated them breaking the code for me and the timeliness.
VETSTYL
Ronnie, for your Corvette we recommend:
RP 5W30 or 10W30 Motor Oil - with XPR 5W30 for the ultimate oil.
RP Synchromax for the 6 speed.
RP MaxGear 75W90 for the rear differential
RP MaxEZ Power Steering Fluid for the power steering system
RP Purple Ice Coolant Additive added at 1 oz per quart of system capacity.
Cheers,
David
I really appreciated them breaking the code for me and the timeliness.
VETSTYL
Instructor
Joined: Apr 2004
Posts: 245
Likes: 0
From: Springfield MO
There is an excellent article in the Sept. 2006 issue of Corvette Enthusiast magazine. According to their test on a dyno the Royal Purple showed an increase of 3.8 hp and 4.8 torque. They left the car strapped down and changed the oil. They didn't want any change in tension in the straps. I will let you draw your own conclusions. I am changing at my next oil change.
Melting Slicks
Joined: Nov 2005
Posts: 2,481
Likes: 267
From: So-Cal California
2023 Corvette of the Year Finalist - Modified
2022 C5 of the Year Winner - Modified
Another RP user here. My car burns less oil with the purple stuff in there. Drove her to PA and back to So-Cal, 10,000 miles and only used up less than 1 quart.
Safety Car
Joined: Jun 2004
Posts: 4,960
Likes: 527
From: Witness Protection Program Somewhere, USA
There is an excellent article in the Sept. 2006 issue of Corvette Enthusiast magazine. According to their test on a dyno the Royal Purple showed an increase of 3.8 hp and 4.8 torque. They left the car strapped down and changed the oil. They didn't want any change in tension in the straps. I will let you draw your own conclusions. I am changing at my next oil change.
Just put it in mine for the first time this last oil change after I saw this. Also have used it in our race cars for several seasons. Yes there is more HP and yes during teardown the insides look brand new.Definitely as good, and maybe better than M-1, so why not try it.
Advanced
Joined: Mar 2005
Posts: 78
Likes: 0
From: Pittsburg California
well I just bought RP for the tranny and Diff, but bought Mobil 1 for the engine. I guess when the next oil change comes I will switch over to RP but I only cruise with my car, don't have time to do anything else so I think Mobil 1 should suffice, but yeah the tranny and diff get the good stuff.
Either way I would always spend more if I was tracking the car, but if your a weekend cruiser I wouldn't worry to much, its all good.
Either way I would always spend more if I was tracking the car, but if your a weekend cruiser I wouldn't worry to much, its all good.
