Royal Purple = Underrated Extended Drain Oil?

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I have never been a big fan of RP motor oils(most boutique oils actually), but based on some of the UOA's I've seen over the years, they do appear make a good oil. Their racing oils are highly regarded.

Royal Purple 5w20 and 5w30 have a starting Tbn of 12. Tbn retention seems to be pretty good too, based on UOA's I've seen. Shearing aside, their oils do have some very good qualities. I don't know of many oils with a higher Tbn. They are also API SL, for those wanting a bit more ZDP.

http://www.royalpurple.com/prod-pdfs/motor-oil-ps.pdf


Quote:
Note: Engine oil’s solvency cleans wear metals and
deposits left by previous oils. These wear metals and
deposits can cause abnormally high values on used
oil analysis until the engine is clean
 
As you can see,RP is not a favored oil on here.
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They say engine teardown is the ultimate proof of an oil`s quality. The Mustang GT cams proved (at least to me) it`s an awesome oil!
 
Originally Posted By: buster
I have never been a big fan of RP motor oils(most boutique oils actually), but based on some of the UOA's I've seen over the years, they do appear make a good oil. Their racing oils are highly regarded.

Royal Purple 5w20 and 5w30 have a starting Tbn of 12. Tbn retention seems to be pretty good too, based on UOA's I've seen. Shearing aside, their oils do have some very good qualities. I don't know of many oils with a higher Tbn. They are also API SL, for those wanting a bit more ZDP.


I'm not a big user of botique oils either, but the combination of 4 things led me to run RP in one engine: 1) SL/ high phosporous for flat cams, 2)the grade I wanted- RTS 5w40 is a little to thick, 3) Group IV, 4) availability better than Amsoil or Redline.

So far I'm happy, the UOA will tell more.
 
Buster, I agree 100% with you. RP is a very under-rated oil on here. It has very high detergency and TBN levels, and should handle 10-15k drains with ease.

As for Mg in the oil, I'm pretty sure i've read here that Mg is actuially a more powerful detergent additive for the amount used than Ca that is usually used. RP uses lots of both!
 
ARCO, why would you object to magnesium as an additive? It seems like most people around here would like to see PCMOs behave MORE like HDEOS (apart from the high viscosity). I understand that some HDEO detergent and anti-wear additives are counterproductive in terms of ultra-low friction (you'd never see them in M1 AFE, for example) but in general I'd prefer better anti-wear over ultra-low friction. Or is it concern that the Mg displaces/reduces the effectiveness of some AW additives?
 
Originally Posted By: GROUCHO MARX
Cheap? No.


With the higher TBN you should get more miles out of it which could make it cheaper than other synthetics.
 
Royal Purple is overrated, over advertised, over marketed, overpriced bull hockey IMO.

Trying to make it into an extended drain oil pretending that it has better additives than say Amsoil or M1-Ep or Castrol Edge is simply over reaching and goes against what this site is all about. ROYAL PURPLE IS NOT AN EXTENDED DRAIN OIL.
 
Originally Posted By: aquariuscsm
They say engine teardown is the ultimate proof of an oil`s quality. The Mustang GT cams proved (at least to me) it`s an awesome oil!


Those pictures prove nothing. That was no scientific experiment with a controlled study? It amazes me what kind of silliness gets passed along as fact on this site.
 
Originally Posted By: addyguy
Buster, I agree 100% with you. RP is a very under-rated oil on here. It has very high detergency and TBN levels, and should handle 10-15k drains with ease.

As for Mg in the oil, I'm pretty sure i've read here that Mg is actuially a more powerful detergent additive for the amount used than Ca that is usually used. RP uses lots of both!


I think so too. I've noticed the Tbn retention is pretty good with RP, so I'm not just basing this off of the initial Tbn of 12.

Mg is an older additive that was used by Amsoil for years. They ended up following Mobil's lead and started using overbased Ca as a detergent when API SM came around.
 
Originally Posted By: GROUCHO MARX
Underrated? Maybe. Cheap? No.



With the last PP oil, and Pure one rebates, I can do a 6 quart and filter change of Pennzoil Platinum for the price of 1 bottle of Royal Purple.
 
Well when you pay that much for an oil you generaly expect it to out perform far cheaper oils like Mobil-1,PP and RTS etc....... Normally one expects to get something more from a product that cost's more then other products more easily available.

I have always been very clear with the fact that Royal Purple isnot a bad oil it is just far too expensive when it returns results no better then Mobil-1,PP,RTS 5W40,Amoil and Redline which are all cheaper then ROyal Purple!!!! TYpicaly their Race Oil's are on par with Amsoils and Redlines regular non race oils but again they often cost $3-$6 more per quart then either Redline or Amsoil.

With reguard to their Gear oils well lets just say they do not hold up to extremes like Redline or Amsoil gear lubes and their various MTL like products are absolutely worthless. I tried them and in my TOyota they lost their cold weather performance by 10,000 miles which in a cold state with long winters like MIchigan has is unacceptable of a premium priced synthetic lubricant.By comparison I get about 40,000 miles of excellent cold weather shift performance with Redline products before I start to experience a subtly degradation in shift fell ans such.

I actually find it repulsive that I cannot buy a Hot ROd,Mopar,4X4 magazine or watch anything on SPEED Channel or SPike TV with out having to listen to people with less oil knowledge then my 11 year old son push Royal Purple Products every chance they get!

I can live with the shearing of their oils even though I think it is odd that any synthetic 5W30 would shear that badly but I do demand a price that is inline with the performance of the product! I am not the type make purchase's based on marketing and fad's with in a sub-culture. THe only reason I spend the premium money on Redline gear oil is because it offer's me performance that I can not get from OTC products so the premium price is due to added value not because I am paying for agressive marketing plan! I do not pay the premium for their motor oils because I do not need a POE synthetic with beefy additive package to go 6 months or 10K miles OTC oils that are far cheaper can do this.

So while this site is subject to much hype German Castrol,Penzoil Platnium etc........FOr the most part few people on the site are the types to just toss money to the wind. Many are frugal and with out much more drastic performance difference between RP and other cheaper synthetics not a lot are going to go googoogaa gaa over it!PP was for a long time dirt cheap and it offered sludge cleaning as an added value. M1 0W40 also ofer's sludge cleaning as an added value but M1 onlymentiones it on their sight not on the side of the bottle.

Marketing hype is one thing we are more immune to on this sight. Not so much these days as the number of professionals in the field of tribology,chemistry, or automotive industry has dropped and more and more average Joe's have joined up. Marketing is for those that do not and will not seek out technical information to make non-emotional decision on purchase's! I hate front wheel drive cars and I hate 4 cylinders in car's but I am driving a front wheel drive Camry with a 4 cylinder because that was the practical thing to buy since I got it with everything but a Sunroof and mag wheels for $17,000 brand new with 4 miles on it.Had I bought what I wanted I would have a 4Runner or FJ Cruiser in the parking lot right now!Same thing or same type of non-emotional reasoning is how I pick most lubricants. A combination of utility, cost and any value added.
 
I do not have a grudge against RP,

I just do not buy any oils for my Ferrari that do not have a HTHS number, and RP refuses to disclose this parameter.

The rest of my fleet gets dino oil at reasonable change intervals.
 
Originally Posted By: PT1
Originally Posted By: aquariuscsm
They say engine teardown is the ultimate proof of an oil`s quality. The Mustang GT cams proved (at least to me) it`s an awesome oil!


Those pictures prove nothing. That was no scientific experiment with a controlled study? It amazes me what kind of silliness gets passed along as fact on this site.


It amazes me how some people so readily dismiss evidence because it wasn't performed on a bench.
 
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