Interesting…
Dennis M Fitzpatrick -
Royal Purple does not agree with you post regarding Royal Purple being junk and Amsoil all the way.
First off, you are on the Royal Purple Facebook page, would you like directions to the Amsoil page? Are you on our page because we can answer your questions?
As for Amsoil ALL the way, let’s look into that –
Let’s start with any synthetic motor oil that you choose will benefit you vehicle better than conventional motor oil whether you choose Royal Purple, Mobil 1, or Amsoil, but Royal Purple can offer you something a little more.
Amsoil doesn’t have any 3rd party independent studies done that show their product out performs ours and the ones they do claim are conducted by dealers or their own labs. Amsoil’s test are conducted under their supervision with their people running the test, but the lab sounds like an independent lab in the way it is presented. A key example of this is the 4 ball wear test.
The ASTM D4172 Test (4 ball wear test) is NOT an accepted engine oil test nor indicative of actual field wear performance for engine oils. Per the ASTM 'Significance of Use description", the ASTM declares that there is no correlation between oils of different formulas or to actual field wear data. This test was designed to quickly compare ‘batch to batch’ quality of the exact same formula of oil during production.
Amsoil also has a bad habit of claiming ASTM, API acceptance and/or test protocol and then modifying the test in-house. The ASTM D4172 should run at 1200 rpm and 75 C. Amsoil ran it at 1800 rpm and 150 C. At that point, it becomes an ‘Amsoil’ in-house test, not an ASTM repeatable test. Why did they modify the test? To make their oils ‘look’ better? Amsoil has taken this test and made it a big selling point and consumers have no idea what the test was intended for. Amsoil also has a bad habit of claiming ASTM or API acceptance or test protocol and then modifying the test in-house. They also do not run the ASTM Timken OK Load test - the RP oils would score first in this test having 300-400% better performance than the others.
Amsoil’s typical miss-interpretation of results can even be found in their own reports. They test regarding film strength si not about film strength but is about wear.
They have even shown where Royal Purple has the highest rating for wear protection in the FZG test and highest rating for oxidation protection, but yet they score Royal Purple the worst in a ‘wear test’. Why, How? Amsoil will not report on Royal Purple’s Oxidation resistance in a TFOUT test. WHY, because Royal Purple will actual tests out to 1300 minutes and is 2 ½ times better than theirs! They arbitrarily stopped the test at 500 minutes. We also had some of the best results in the cleanliness results for keeping your engine free of deposits and corrosion and zero foaming yet they claim we failed a rust protection test? Confusing - hard to judge as they do not share the actual coupon of the metal - just report a failure and they also will not state how many coupons they ran with each oil - or did they run the test until they got a ‘failing’ one and reported it?
Why does Amsoil have it out for Royal Purple? How Could someone mess up these results? EASY, at the end of all of the studies you will usually one or both of the following names
Dave Leitten- AMSOIL Laboratory Director and Kevin Dinwiddie - AMSOIL Drivetrain Specialist
WOW, you mean to tell us they work for Amsoil and every test run and distributed that Amsoil was ranked number 1 is done internally. Yeah there was no favoritism to their company?
Just thought we would clear some of the air.
We still refer back that Amsoil makes a great product, but Royal Purple can and does things better and different than they do.
Have a nice day.