Royal Purple says this about Castrol Edge

Pennzoil motor oil
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Originally Posted By: GrampsintheSand
Originally Posted By: 440Magnum
Originally Posted By: Colt
Royal Purple would be one of the last brands of synthetic oil I would use.
Just on top of Super Tech.


Why's that? I'm not a brand apologist and I've never used RP in an engine, so I'm just curious to what objective measurements make you say that. Granted, their love of the Timken "test" is bothersome, but other evidence? used oil analysis? VOAs?



http://lmgtfy.com/?q=RP+UOA+site:bobistheoilguy.com


And the results are some good used oil analysis.

So I'll repeat his question. :)
 
Originally Posted By: aquariuscsm
TOTALLY off topic,but I just read that link from above ^^,and was going through the questions submitted by consumers and saw this one about the PAO bast stock question:

http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Group_3_Base_Oils.aspx






The subject is about the 4 ball test and one oil over another. Of course this test is mainly about EPs which are irrelevant to motor oils and can cause corrosion. Thats why quality oils don't use them.
 
I can see using EP's in oil in a race engine that sees extreme pressure and abuse and is then going to be changed. I am not sure how valuable they are in a normal street engine.
 
Originally Posted By: ZZman
From their FAQ section

The Sequence IVA test is an industry bench test that is used to test oils for API licensing purposes. Some portray this as a sound methodology for predicting wear protection. We believe the ASTM D-2782 Timken Load Test is a better methodology for predicting wear because the Timken test actually measures a lubricant’s film strength (its ability withstand the effects of load, speed and temperature without breaking down and allowing metal to metal contact). Royal Purple has dramatically higher film strength versus competing lubricants. For instance, Royal Purple has nearly 6 times the film strength of Castrol Edge®.

• Royal Purple film strength = 113,839 psi
• Castrol Edge® film strength = 18,979 psi



To my understanding, when this test is done, they just pour oil out of the bottle into the test and then grind a oil soaked bearing to see what oil shows the smallest wear scar.

*Note the oil is not at operating temp and there is no fuel/water diltution and/or contamination to deal with.

The test is useless.

What one taste better? ? ?
 
Originally Posted By: ZZman
I can see using EP's in oil in a race engine that sees extreme pressure and abuse and is then going to be changed. I am not sure how valuable they are in a normal street engine.


I guess its a question of balancing the possibility of soft metal corrosion against protection of things like flat-tappet cams with high spring pressure and helical gear drives for oil pumps found in older engines. There's not a lot of exposed brass or copper in those engines to corrode (if the babbit's worn through to expose the copper on the rod/main bearings then there are bigger problems), and there definitely are high-pressure contact points. Modern overhead cam/roller follower engines with light spring pressures and oil pumps driven directly on the snout of the crank- no need at all.
 
Originally Posted By: 440Magnum
Originally Posted By: Colt
Royal Purple would be one of the last brands of synthetic oil I would use.
Just on top of Super Tech.


Why's that? I'm not a brand apologist and I've never used RP in an engine, so I'm just curious to what objective measurements make you say that. Granted, their love of the Timken "test" is bothersome, but other evidence? used oil analysis? VOAs?




Castrol loves the Sequence IVA test, all companies love at least one kind of test.
 
One thing I respect Mobil for and that's they don't use these bench test in a public way ,trying to discredit their competition. They advertise their oil to be a quality product and leave the irrelevant bench test to their competitors.
 
Originally Posted By: Bryanccfshr
I wouldn't call THe Seq IVa irrelavant




I was thinking the seq 4a test is not a bench test. How is that test performed?
 
Originally Posted By: Audi Junkie
Royal Purple has no credibility at all, and then there's Mobil...


In my reading here and elsewhere, I've come across a few very straightforward and at least moderately technical answers from RP, so I wouldn't say they have "no credibility." Score 1. On the other hand, they seemingly worship the Timken test, which is at best limited in applicability, at worst meaningless. Strike 1.

Mobil seems to have a product that has earned a good reputation over several decades (price for value notwithstanding), but suffers from the usual large competitive corporation aversion to answering even the most basic technical question. Their dodge on whether they are pure PAO base stock is a classic for the ages. A whole paragraph to say.... absolutely nothing except marketing buzzwords.
smirk2.gif
And its not like its a black eye if they *aren't* 100% group IV base. Shell Rotella synthetic is showing some outstanding used oil analysis, and is quite up front about being Group III.
 
I've used Royal Purple in passenger vehicles and race cars with excellent success. My Titan, which is a TOWING VEHICLE, is constantly subjected to high load with something in tote. With over a 120K of this constant abuse and half the oil changes with RP 5w30, why all the hate when it runs like new? It may be a little on the expensive side, but it has good used oil analysis in spite of being marketed as a performance based oil for people who are hard on cars.

In equal conditions, I say it will hold it's own.

Most of the RP haters simply can't find something else to complain about.
 
Most of the haters have had experience with RP and seen how bad it is. Sorry to say there is enough documented proof that shows there are better oils.
 
Boy this puts RP in the same lame league as Amsoil, I thought they were better.

So why don't the oil co. and car co. use the Timken test? Duh, they aren't cheap a**es like these Mom and Pop companies.
 
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