i can't verify this directly with the publication since the link is no longer active, but there is a forum that found a post script to their testing:
"A few months back (issue 108), you might remember we did an oil comparison. At the time, we thought it was a bloody good thing, and we don't mind telling you we were pretty proud to publish an article that basically bagged a heap of big name brands. You see, at Street Commodores, we can't, and won't be bought. We like to play things straight. And in the name of playing things straight, we'd like to tell you what has happened since that story went to print.
Basically, we made a few oil companies very cross, and some others quite happy; but we've also been educated some more on engine oils, and being the type of publication that we are, we wanted to fill you in on it. The information we've learned since then suggests the test we performed may be irrelevant.
Some sources have advised us that the test we used would have been better served testing some of our favourite greases rather than the engine oils we commonly use on our street cars. Sure, we did the test with the best intentions, with a level playing field for each oil and no preconceptions as to who would perform better than another, but when, and if, we mess up, we like to think that we're man enough to set the record straight."
To me...BEVO, this was a visual test...one that I can make my own judgments from and not defensible, through pages of 'approved' methodology...etc. This visually showed me, even if a Chimp was the one doing the same exact, pouring the oil sample into the bath...putting a new unscathed bearing sample on the machine...applying the SAME weight to cause load and friction between the two parts, one not moving the other applying the point-of-contact friction to lock up...
This editor, trained chimp, the guy's wife...his neighbor...whomever, lol...if they all did it, each and every sample...did them the same...then what 'methodology' must be questioned? I would certainly question any of the brands, if each sample was done by a 'factory representative'...certainly...but that didn't happen here...the guy did the test...and this was the visual results, with photographs taken...
To see that there was NO damage to the Royal Purple sample bearing....visually to myself...tells me I have no further need to worry 'if' there might be later on, some ensuing wear/abrasion damage between the cam lobe and the bottom of the H.L. following its course. Nope...I put more on my own ability to recognize test output by seeing results, rather than relying on a page printout...of various metal trace compounds. I saw the bearings of the other samples...and can only IMAGINE, the amount of metals floating in the oil...that should still be upon the surface of those bearings. Royal Purple? Pfttt. I'll now sleep nights...and it bears out over a lot of forums (since buying it last week) by users of the brand in bikes, ATV's, water crafts, lawnmower equipment, generator engines...that since having switched to this brand with Synerlec additive packages, they have stuck with it, for better operation of their noted equipment. Visually? After viewing the results from the photographic evidence, after each bearing test, with my own eyes
, no matter what methodology was used, as long as each sample was subject to the same as was here......I'm sold. All of the bearings were crapped out...except for the Royal Purple 10W40 sitting in its sample bath. Visually...it killed the competition in oil film load endurance. That is what I am singularly after regarding my oil choice for my SVTC. Oil film endurance (and its continued premium lubricity factor) is critical to the continued great operation of this fine bike....keep the cam lobe pushing up on the H.L...but...leave the metal surfaces intact on the bottom of the H.L's, where the cam lobe finds it....
Bevo, from the test results between two examples:
Redline brand: only 6,389.06 PSI, before bearing damage caused by the further inability of the lubricating film surface to maintain protective lubrication between the two metal parts, the pressure point, and the rotating bearing sample...with subsequent----> failure
Royal Purple brand: (this should blow any reader's mind----->) Royal Purple withstood a per square inch pressure of (are you ready?!?!?)----> 131,432 PSI before it became unable to separate, and lubricate the pressure load, and the rotating bearing sample! That...was no typo!
There is NO WAY that the lift pressure exerted in PSI, upon the lower bottom of the H.L in the SVTC's 1854 cc engine, comes mind-boggling near, the lubricating PSI failure threshold limit of Royal Purple, folks.... Look at the Redline PSI threshold, and then once more gaze at the R.P. PSI threshold. No kidding there was no damage caused between the weighted pressure applier, and the rotating bearing sample. No kidding! SVTC owners...glance above at those figures one more time...and then YOU decide, what any visual, or heck...any printed metrics, get you to move one way, or the other....yes, it's a personal 'deal'....Personally for myself, I choose a product lubricating inside my SVTC that can take a pressure point between two opposing metal surfaces....at 131,432 pounds per square inch...before one scratch or gouge mark might star to evolve.
I picked up some sometimes you hear, sometimes you don't...transmission gear whine, when having had the break-in YamaLube mineral 10W40 swapped out with the top of the line, YamaLube 15W50. Dependent on whether I was single, or with my wife aboard, with or without luggage, how much throttle/torque I put to the transmission, I'd either get no whine, or some whine. There was none in running a 10W40 viscosity. It will be interesting, I'm sure to myself as well as others, if upon introducing 10W40 back into Charlotte, whether I will hear any further tranny gear whine. If I don't...then American (Bill ) is most right on....the SVTC runs better...working less hard, internally with 10W40 as its blood.... I'll let everybody know, as soon as I see how the bike runs/sounds, post Royal Purple Max-Cycle 10W40 installation. That will be in the not too distant future...for I want to get one more tour out of the YamaLube 15W50, and then the R.P. goes in. I'll be sure to do it before I can't ride...and will report my findings...