Originally Posted by John Adams
Chris, there were no controls for time, temperature, load, the environment the so-called test vehicle was used in, no controls for the fuels used, the oil filters used, any pour in oil additives used, (or their remnants from previous use), or even the style or type of driving done, etc. All these uncontrolled variables can and do have distinct effects on any results. If driver A drove 55 mph on the highway to work and back every day with a total of 50 miles per day traveled, versus driver B. driving 15 miles to work in stop-and-go city traffic, but they both drove 3,000 miles before changing the oil, that by itself can dramatically effect test results on the oil and this is just one example of why this so-called test is invalid. With such a plethora of uncontrolled variables, this makes any test results totally invalid, especially when untrained individuals attempt to interpret the results. No controls were even used in collecting oil samples, or even if the oil samples were correctly collected, (most people have no idea how to correctly gather an oil sample), which also can have a huge impact on test results.
Again, over and over, no controls whatsoever to a myriad of variables totally skews any test results, making them invalid and of little or no use.
Being as the thread was closed, I feel compelled to reply to this, then let it die.
I understand what you are saying, however, in MY findings, I have found similar results as the testers in the links have. And in different vehicles, conditions, etc. The results I have found is that Amsoil is NOT that much better, if at all, of an oil than what avalible off the shelf, and at much less cost to the consumer. Most all synthetic motor oils are very capable of extended oil change intervals of 20k miles or more. In fact, I have personally seen an engine run for 37500 (+/-) miles on Dyno oil, with NO oil added during the cycle. In fact, it was run with the factory oil, from mile 0, until 37500. And today, the engine currently has over 150k miles on it. Now.....Im not saying Amsoil is a bad oil. Some think it is, while others dont. And oil brand seems to be a pretty personal thing for people that are fond of the vehicle they are driving. I have put Amsoil up against Mobil 1, and other synthetics, and when comparing the oil reports, I have not seen anything that would make me want to use Amsoil over any other oil. Any of the results that may have been better than the other oils, was "better" by the smallest margin. Most reports returned, showed it to be marginally less than the off the shelf synthetics I have used. Given the amount of total vehicles (about 90), conditions, etc., I feel confident in the choices I have made in the oils I use, and in the vehicles they are used in. Amsoil is not used in any of our vehicles. Now.....That all being said, The bottom line is, a quality oil, be it dyno, or synthetic, in a modern vehicle, and changed on a regular interval, will be just fine.