Royal Purple
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Stick with the Mobil 1 and save $$$$. Unless you are racing the car every day and have thousands of dollars into a very hopped up motor, its a waste. It might make you feel better inside but you are just fooling yourself.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Royal purple is very good oil. Probably one of the best oils that you can get. On the other hand, Mobil 1 synthetic is also a very good synthetic oil. I dont believe the benifits of running royal purple "ENGINE OIL" over mobil 1 "ENGINE OIL" on an everyday LSX engine will be seen or are worth the extra money.
On the other hand,,,,running Royal purple in the differential and transmission is another story! That is where you should use royal purple!
BC
On the other hand,,,,running Royal purple in the differential and transmission is another story! That is where you should use royal purple!
BC
Le Mans Master
Joined: Aug 2002
Posts: 8,222
Likes: 0
From: Norfolk VA
I run RP in the Trans and Diff and M1 in the engine. M1, RP, Redling and AMSOIL are all top quality products. I doubt you will notice any difference between them. The only reason I run the RP is that it is the only Synthetic ATF and gear oil I could find locally.
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Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Though this isn't an automotive engine oil comparison, it may still interest you. AMSOIL has started including Royal Purple in their comparative oil testing. They just released this comprehensive report on motorcycle oils last month that includes both Royal Purple and Mobil's motorcycles oils. You can draw your own conclusions as to how this relates to the performance of their automotive engine oils. 
AMSOIL Motorcycle Oil "White Paper" (1 MB pdf file)
AMSOIL Motorcycle Oil "White Paper" (1 MB pdf file)
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Originally Posted by allmee
After reading that, RP is looking better than M1. Thanks for the info!!
- RP sheared low out of grade in both 40 and 50 weights, M1 stayed in grade in both.
- RP was ranked 9 of 11 (40 weight) and 7 of 15 (50 weight) in High Temp High Shear, compared to M1s 5 of 11 and 2 of 15 respectively.
- RP was ranked 11 of 11 (40 weight) and 15 of 15 (50 weight) in the 4-ball wear test, compared to M1s 1 of 11 (tie) and 7 of 15 (tie) respectively.
- The RP did pass the 40 weight gear wear test whereas the M1 failed stage 13 of 13 with 320mm of wear, but both passed the 50 weight gear wear test.
- RP was ranked 10 of 11 (40 weight) and 15 of 15 (50 weight) in the volatility test, compared to M1s 1 of 11 and 4 of 15 respectively.
- RP failed both the 40 and 50 weight rust tests, whereas M1 passed both
Overall, the test ranked M1 3rd and RP 7th.
Race Director
Joined: May 2001
Posts: 15,323
Likes: 2,077
From: Guelph, Ontario
Royal Purple's 5w30, 10w30 and 10w40 all tend to shear down quite quickly, but their Racing 41 is an excellent choice for the LS1. It doesn't thin down as easily and oil analysis results have proven it's completely safe for normal street use, even up to 7 or 8k.
Pro
Joined: Oct 2004
Posts: 514
Likes: 2
Originally Posted by Subdriver
Though this isn't an automotive engine oil comparison, it may still interest you. AMSOIL has started including Royal Purple in their comparative oil testing. They just released this comprehensive report on motorcycle oils last month that includes both Royal Purple and Mobil's motorcycles oils. You can draw your own conclusions as to how this relates to the performance of their automotive engine oils.
AMSOIL Motorcycle Oil "White Paper" (1 MB pdf file)
AMSOIL Motorcycle Oil "White Paper" (1 MB pdf file)
