Oil Test

[Twice Bitten]

http://www.animegame.com/cars/Oil%20Tests.pdf

[Firme]

Nice find! Where is the Amsoil in the test????

[SuperG]

Wow, cool article...so which oil will you guys use? It seems Royal Purple did very well...way better than a dino oil, like I use.

Also, here are some notes from a friend of mine (Amsoil user) regarding the tests and outcomes:

"The test is one of the better tests out there although it only measures one facet of performance.
- Accuracy: the test is greatly dependant on starting with a perfectly round, smooth race which is hand polished between tests. This is critical to giving contestant #2 a fair shake. These guys probable did a good job, but I’d want to see the field notes and pictures.

- Viscosity: not all oils tested were the same viscosity. This gives an unfair advantage to heavier oils. I’d expect any oil with a 20-50 grade to have a better chance than a 0-40 or equivalent. Still I liked the test a lot.

- Temperature: All oils break down eventually, and the temperature varies widely. It would be important that any oil chosen would be stable at your engine oil and component temperature. Royal Purple is good, but I do not know the magic temperature.

- Volatility: all oils loose some volume as vapor under operating conditions. This varied WIDELY between oils. 20% loss for Pennzoil and 3% Amsoil. I don’t know about RP(I’m sure it’s good). This is usually a function of the lighter Molecular Weight molecules evaporating, leaving the heavies behind. The more uniform the MW, the better performance.

- pH stability: This is serious business. Blow by gasses are NOT stable and react with anything they come in contact with, and contain a high percentage of water vapor from combustion. Reacted oil is typically a fatty acid in nature and depending on the water content drive the pH low, causing significant corrosion during off cycles of the engine. This was the original basis for the 3 month interval. All oils have pH buffers and some oil molecules are more resistant to blow by gas oxidation than others. This is why Amsoil stands by their oil for 12 months and longer if you do a test to determine if the oil retains enough buffer agents for continued operation. RP is also a good oil on this front, although I do not know the specifics.

- Sludge suspension: blow by gasses end up creating large organic particles. Good oil can keep these in suspension, poorer oils allow the particles to drop out."

[ORANGE CRUSH]

Great find!


I hope this is true about RP. If so I have no worries.

[jimmysidecarr]

Excellent find!!!

Royal Purple street oil here also...

Hoping to keep everything in the engine...


IN THE ENGINE!!!




...

[JBoden]

GREAT article - Looks like RP is the best buy - I've been using Mobile 1 for years and feel betrayed. Shame on Mobile

I'm now a Royal Purple customer.

[Twice Bitten]

oil comparison test

--------------------------------------------------------------------------------

Here is part one. Pressure test.

http://www.animegame.com/cars/Oil%20Tests.pdf
1. ROYAL PURPLE Racing Oil full syn 20W50 withstands 295,722 psi

2. ROYAL PURPLE Street Oil full syn 10W40 withstands 131,432psi

3.VALVOLINE DURABLEND semi-syn 10W40 withstands 23,858psi

4. PENNZOIL semi-syn 10W40 withstands 9,200psi

5/6. Tie RED LINE full syn 5W40 withstands 6,389psi

5/6. Tie MOBIL semi-syn 10W40 withstands 6,389psi

7. SHELL semi-syn 15W50 withstands 2,920psi

8. SHELL full syn 5W40 withstands 2,567psi

9. CASTROL full syn 0W40 withstands 2,011psi

10. MOBIL 1 full syn 0W40 withstands 1,540psi
__________________

[SuperG]

Any particular oil filter to use with RP? I have seen Mobil1 users get Mobil1 filters...

[red04svtcobra]

WOW!!! I may just end up switching to royal purple through out the whole car. What oil weight and filter do you all use? BTW I am now using Mobil 1 and will be switching to RP!!

[jimmysidecarr]

There are better then oe filters out there but I have not researched them ...

I work at a Linc.Merc dealer so I can buy oe stuff at a nice price... though Wally World does beat my 10% over cost price sometimes because of their trainload price breaks.

Therefore I use a Motorcraft FL 820 S filter.......... and RP 10W30 street oil(prefered for my usage and climate)

or 5W30(if I can't find the 10w30... or if I was in a colder climate).

I don't like the 5W20 weight... though it is slightly better for fuel economy.

[tazzracing1]

I did see a test that did do Amsoil and the royal purple was still better.

[Twice Bitten]

For the 2000 Cobra R 5.4L 32 valve engine,
XPR 5W30 or XPR 10W40.
There is no reason to run an SAE 50 in this engine - the bearing clearances are under 0.003 and by running a 50 wt oil is creating fluid drag as well as less flow than a multi-weight SAE 30 or SAE 40.

For the Manual transmission - RP Synchromax (3.3 quarts)
For the Rear Differential / Independent Rear Suspension - RP MaxGear 75W140 (1.5 quarts) No friction modifier is required - it is already in the fluid.
For the Power Steering Pump - RP MaxEZ Power steering Fluid (same as what is used in many NASCAR PS units)
For added cooling - RP Purple Ice Coolant Additive - add one bottle to a mix of antifreeze and water

5.4L Supercharged engine - RP XPR 10W40 - if you are not convinced on the lighter viscosity, then XPR 20W50.
This vehicle will never see any temperatures where an SAE 5W is needed and more VI improver is needed to make an SAE 5Wt act like a 50 Wt at operating temps than an SAE 10 or SAE 20 Wt.
See the attached viscosity curve as well as a picture of a Koeniggsegg that RP is factory fill on that has used a similar 5.4L Supercharged engine - but has been in production for the last 5 years.

For track events, the XPR 5W30 will provide the biggest performance gain and we have 700+ horsepower race engines running on the XPR 5W20 in dry sump circle track and road race conditions.

For track days, since getting every bit out of the morning is not always the primary focus, using the XPR 10W40 is a good conservative approach.

As for the GT - I've got a guy in the Dallas area that has done similar mods for the +700 and he's using the XPR 10W40.

The only reason to go up to the multiweight 50's if you're having a problem keeping oil temps below 230 - 240 F during track events and or are having a fuel dilution / contamination due to tuning.

[jimmysidecarr]

Jarid Martin and I used to work together at Texan L/M... He now works for RP.

Nice gig!!!

Good stuff Larry.. and sound advise and tech.

--> "a picture of a Koeniggsegg that RP is factory fill on"

..

[Firme]

Originally Posted by tazzracing1

I did see a test that did do Amsoil and the royal purple was still better.

I keep going back and forth on my opinion of the two. There is definitely marketing forces at play, and test variable can alter results in favor of each.

http://www.performancemotoroil.com/R...rple_info.html

http://www.performancemotoroil.com/Dyno_test.html

[ORANGE CRUSH]

Dam it Firme! Now I'm all confused