Originally Posted by jackedupcanyon
I only run AMsoil. Have seen various test results, independent dyno experiments, studied some of the differences in properties and looked closely at the wear tests. I believe in AMS so much that I became a dealer.
I'm in complete agreement with you... Not only have I seen the tests, I've run Amsoil since 1977 and have done a lot of testing myself. Early on, what convinced me about the product was my own testing performed while I was a quality control specialist for Hydraulic Unit Specialties Company (HUSCO) manufacturer of hydraulic control valves. While there, I earned two patents in areas that I researched, and as their QC man, I had acess to a lot of oil testing equipment including a Royco particle counter, viscosity measuring equipment, spectrographic equipment, and an ASTM recirculating ball test rig.
I ran a number of widely available motor oils through as many tests as I could. Several stood out in my mind as noteworthy. First, the bad... Pennzoil was HORRID. It failed every test, including the particle test for cleanliness. The only oil at that time that was worse was Quaker State, which ended up having me call in a service rep to repair the Royco particle counter. The Quaker State plugged the machine -- something even the rep said that he had never seen before. Both of these oils also utterly failed the recirculating ball test, with Pennzoil cutting a deep groove in the shaft within 3 hours, Quaker State cut the shaft in half within an hour (which matched the expectations based on particle counts on the Royco).
Middle of the road -- acceptable in every standard -- were oils like Mobil (this was pre Mobil 1, would have loved to test it against Amsoil), Shell, Rotella (also Shell), and a number of regional or smaller-named brands. They did a typical job on all tests. All made measurable marks on the reciculating ball test shaft, but none were outside of reasonable limits for the oils we tested regularly.
Standing out for dino oils were Valvoline and Havoline. Both did remarkably well on the particle counts, and also on the recirculating ball test that I ran. Of the two, Valvoline was tops, after 30 days, it wore a shiny spot on the shaft that was not measruable. The Havoline made a measurable mark, but barely (50 millionths of an inch).
Then came the Amsoil... It flew through all tests, but the viscosity test was unable to ascertain its flow properties. I believe that it was simply outside the normal range for the equipment that I was using. Flow rates were higher than expected in this regard, which made us wary about lubricity on the ball test, but that later proved to not be the case. After 30 days of running constantly, the Amsoil did not even make a shiny mark on the test shaft. We checked spring pressure and drip rates to insure that all was within specs, and they were. On that day, everyone that witnessed the test results became an Amsoil user.
We did realize that Amsoil might not be the best oil to use in a break-in scenario, as it simply did not allow for wear in any appreciable manner, and it seemed to us (logically) that some amount of bearing shell and ring seating might need to take place via controlled wear-in, so based on what we knew then (and reinforced after years of use) I did not recommend Amsoil until a vehicle was at above 10K miles.
Note that these tests were limited, and they were my own results. Others might find other results if they did the same tests. If this were to be a truly scientific test, we might have wanted to test multiple samples of each oil, but we were doing this off-the-cuff on company time using company equipment, so we just ran what we could...
I've built over 100 motors in my life, and have seen what different sorts of oil do inside motors. I (and my machinist) can actually tell the vehicle owner (most of the time) which oil they used and how often they changed it based on what I (we) find inside the engine when opening it up. To an engine, I have correctly guessed Pennzoil accurately over 90% of the time. In fact, in last week's episode of "Trucks" on Spike, I suspected that the Jeep 4.0 engine that they tore down was running Pennzoil. That would be very consistent with what I've seen in countless engines over the years, including a Dogde Dakota pickup, one owner, a deacon in my church who changed his Pennzoil faithfully at EXACTLY 2000 miles, who with 89K on the engine had two rod bearings gone, and the timing chain was so loose that it looked like a necklace hanging on the sproket.
I use Amsoil.