Originally Posted by Voyager
Yes, I've found Amsoil similarly evasive in the past with respect to their tests and where they were done. That is why I have little faith in them.
I don't think any of the major oil companies have any reason to challenge their results. Amsoil's market share is so insignificant that why would they bother? It isn't like Mobil and Castrol. :-)
Which MCN issue contained Fred's retraction? I've subscribed to MCN since the beginning and don't recall seeing it.
I tried Amsoil lubricants a couple of times many years ago, both in cars and a motorcycle. I simply did not find many of their claims to hold water. My car didn't get any better gas mileage (I check every single fill-up and keep a log book in all of my vehicles). My Voyager final drive did not run quieter nor cooler with Amsoil, both claims made both by the company and the dealer that sold me the oil. Lastly, their "Amway" like marketing was always a turn-off as well. I am now starting to see their products in a few auto parts stores, but they still are hard to find and their "dealers" come and go constantly.
Amsoil is not evasive regarding their performance testing. Ask them anything you want regarding this. Amsoil publishes more comparative and technical data publicly than any other company by far. You can have complete confidence that their test data is correct using ASTM methods that any certified lab can and has duplicated.
Amsoil's market share in synthetic lubricants is significant and participates in the same API and other oil meetings as Big Oil. They know and respect Amsoil's synthetic oils and would love to have Amsoil's market share added to theirs. If fact, Amsoil was significant enough in the 70's, that Pennzoil took them to court because they thought the public might be confuse the ****** name with Pennzoil. During that time the name was changed to AMSOIL even though AMSOIL won the lawsuit. You can bet that if Amsoil's comparative test data incorrectly showed it's oil to be superior to any competitor, a law suit would be filed. They all test competitors products, but do not divulge the results. Big Oil could make oils as good as Amsoil, but they choose not to. Amsoil has the best warranty in the business.
Fred Rau's retraction appeared in the editorial section a month or two after the article was published. I found one of Fred's updates on the MCNews website regarding the use of auto oils in motorcycles:
"Without going into a whole lot of detail (our full report ran about seven pages long), the best rule of thumb is to avoid any oil with a grade rating BELOW 15. These "energy-conserving oils" contain a higher concentration of ZDDP (Zinc Dithiophosphates),which has been determined by JASO (the Japanese-American Society of Engineers) to be potentially harmful to motorcycles. While there is some indication of possible clutch slippage (minor, and only causing damage over an extended period of time that could run several years), the real danger from these oils is STARTER CLUTCH slippage. This condition would not be noticeable by the rider until the starter suddenly failed.
To be safe, stick with SG or MA (best) rated oils of 15w or higher, or SH-rated (second-best), also 15w or higher. Avoid SJ-rated oils and anything below 15-weight. Motorcycle-specific oils of 5w or 10w (or MB-rated) are primarily for competition use, and though you will notice slightly increased horsepower, smoother shifting, etc., from them, there is a potential of long-term starter clutch and drivetrain clutch damage on bikes that run a lot of road miles.
Hope that helps a bit.
Motorcycle Consumer News Forum Moderator"