BoatTest.com Royal Purple
Synthetic Oil

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Royal Purple Synthetic Oil

Synthetic Oil Royal Purple is headquartered in Porter, Texas, and specializes in a wide range of high performance lubricants for nearly every consumer and industrial application including recreational boating. Its founder was a pioneer in the development of high performance synthetic lubricants and collectively, Royal Purple’s formulators have more than 200 years of expertise in developing high performance lubricants. Royal Purple focuses exclusively on developing state-of-the-art lubricants.

Description

Unlike companies that primarily focus on fuel and other petroleum byproducts, Royal Purple’s sole mission is to develop products that significantly outperform other synthetic- and mineral-based oils.

Royal Purple is distributed in countries around the world including the United States, Canada, Mexico, Japan, China, United Kingdom, Australia and Italy.
Synthetic 2 Cycle Oil
Synthetic 2 Cycle Oil

Inside Royal Purple oil filter
Inside Royal Purple oil filter

Brand new bearing magnified at 1500x
Brand new bearing magnified at 1500x

The same bearing after using Royal Purple
The same bearing after using Royal Purple

J.Drew 11/5/2009 6:36:13 AM
J.DrewI would have liked to see the test done again with both oils/filters bieing new not just the royal blue,for a better comprasion.Fuel consumption allways decreases after an oil change.
A.Graham 11/4/2009 2:36:30 PM
A better question: The improved fuel efficiency was over conventional oil. What about comparing to other synthetics?
M.Loudermilk 7/23/2009 2:26:13 PM
I want to add that I was just as skeptical as any of you. I had a 200 million dollar fleet at stake. "Snake oil" was one of my common comments to the RP rep. But we were using Chevron and Mobil one products before our tests. The units just ran cooler and did not tear up. They don't patent thier product so that is why I don't think any of the big oil companies can get a lower cost alternative. I know. I looked.
M.Loudermilk 7/23/2009 2:17:01 PM
I have first hand econimics on the benifits of switching to this oil. As a manager of a fleet of oil field engines and hydralic top drives. We ran a few tests with royal purple on our Cummins and Detroit power units and Hydralic drives. The resulting maintainace savings were in the MILLIONS. Common wear patters in routine maintance just disappeared. Parts lasted not twice as long but they just stopped wearing out!
C.Hughes 7/23/2009 8:48:28 AM
For T, Amico - If you listen to the audio, you will clearly hear us state that we traveled down the river out into the Long Island Sound to conduct the test, not in a tidal river. The water conditions were the same for each test and the time it took us to change the oil was approximately 37 minutes.
G.Domschke 7/22/2009 9:43:29 PM
Too many questions remain after watching this "Test". And I, for one, will not introduce this type of oil into my Cummins diesel engines, unless, RP signs papers assuring full replacement of said engines/labor if they fail. So far I do not see an endorsement from Cummins for this purple stuff. And yes, there are a lot more already tested syn oils out there that I trust.
K.Reilly 7/22/2009 4:07:08 PM
I agree with R. Stern. If WOT rpm stayed the same, top speed should be unchanged if no other variables have changed. How did you guys measure rpm, eyeball the tach or separate digital meter? If the oil did reduce friction as the fuel burn seems to indicate, WOT rpm should have increased. Something doesn't add up.
T.Amico 7/22/2009 3:49:45 PM
It didn't post all of my comments. how much time did it take to change the oil and what was the tide doing? was it the same as in the previous test? For just this reason I consider the test invalid and I am suprised that a reputable organization like "Boattest.com" would put out this propagandaT,Amico
T.Amico 7/22/2009 3:40:56 PM
I agree with all of the above, especially the variables.Testing in a tidal river was enough to stop me right there.How lone did it take to change the oil
J.Kershner 7/22/2009 3:34:58 PM
Anyone else see all the graphics that they used that were all Royal Purple graphics?
C.Hughes 7/22/2009 3:26:43 PM
In Answer to J,Paskvan – We picked the boat, went to a Pep Boys and purchased the oil, and it was BoatTEST driving. No RP staff or representatives were on site or involved. All oil was 10W 30
C.Hughes 7/22/2009 3:22:52 PM
Great Comments - We wanted to demonstrate what boaters would experience in this test; since no boaters have a dyno in their back yard, we stayed away from the HP. Noise at cruise and WOT would have to be underway and under load, so we found it impossible to isolate the wind noise. Are take away was the fuel burn. Keep it coming guys!!!!
J.Paskvan 7/22/2009 3:10:50 PM
Too many variables for a real conslusion. If the RPMs are the same the speed will be the same unless trim, weight or wind are different. What viscosity oil was the baseline? What viscosity was the Royal Purple? Did Royal Purple supply the boat and driver? You lost a lot of credability on this one.
R.Wallace 7/22/2009 2:47:54 PM
I totally agree with R. Stern. At the CRUISE RPM of 3500 the test showed the speed was the same during each test which is valid. I agree that a good quality full-synthetic oil has advantages in reduced engine wear, reduced engine noise and longer oil change intervals when used with a long-life premium oil filter. When I change my oil in my Yamaha 50HP Four-stroke again, I will get a Marine-rated full-synthetic from someone other that Royal Purple, the OIL with the purple food coloring.
j.doll 7/22/2009 2:47:30 PM
I don't mean to compare apples to oranges, but I grew up around high performance motorcycles which was another market that royal purple went after. i heard a few 'horror stories' about this oil back in the early 90's but don't remember the specifics. anyway, it was enough to immediately drain it out of my sportbike and switch to an industry leader in synthetic oils. If i'm not willing to chance it in my $10k motorcycle, i'm sure not going to put it in an $70,000 boat.
S.Stetz 7/22/2009 2:28:23 PM
Was this a paid ad or an unbiased test? One of the reasons Royal Purple possibly aids fuel economy is that they blend to the low end of the VI spectrum. In your introduction you indicate that comparable oil pressures and oil temperatures are available. When I click on "Complete Specs" I just get a Royal Purple ad. What justifies a longer change interval?S.Stetz
R.Large 7/22/2009 2:10:50 PM
These same factors that Mr Stern pointed out could easily have changed ALL of the "New Results".As an avid BoatTEST.com reader, I'm not convinced that Royal Purple is the best lubricant for your boat (who want's to put food coloring in their motor anyway?) - For anyone serious about performance and synthetic oils I suggest you research the industry leader. With more than 35 years of experience and technological know-how no one delivers products like AMSOIL!
J.Theodoras 7/22/2009 2:00:54 PM
I thought it was well understood that these "super lubrication" additives and oils do make engines quieter and somewhat more efficient when first added, but the effect wears out pretty fast. Are you going to do a follow-up test later? Just my $0.02
M.Wolff 7/22/2009 1:59:24 PM
Those are great questions and I totally agree. Without hooking up to a Dyno it would be too hard to claim more horse power and better fuel economy. I like the fact that noise was lower at idle but what was the difference in noise at full throttle and at cruising? You also mentioned that you can go longer between oil changes with Royal Purple but how much longer?
R.Stern 7/22/2009 1:43:41 PM
If the top engine RPM was 4700 with either oil, that means the props were turning the same speed, regardless of which oil was in the motors. If the props are turning the same speed, a factor aside from the engines HP made the boat run faster. Wind? Current? Weight of the boat? Did you fuel up again after the first test to make sure the boat was at a similar starting weight?