Heavy equipment operators don't change their oil, the mechanics do. Sending out samples for testing is 100% standard practice for any company that's concerned about getting the longest life out of their engines/equipment. If amsoil was so wonderful it would be the standard oil chosen by every company out there. It's not, and not even close.Not true. Most people are unwilling to spend more for a better product. That is why some people buy Black and Decker instead of Bosch or Milwaukee. Moreover, most people do not have the means to determine what product is best. That includes operators of heavy equipment. And I can guarantee that there are differences in composition between all of the products you mentioned, so there will be finite differences in performance. Ultimately, you don't really know which is best. The differences might be small, but they are there. Specific to Amsoil, it has been shown to have a higher level of anti-wear additives, detergents and a higher base number than the oils made by the big manufacturers. It also has lower volatility loss, as shown by the Noack tests. Although engine use is not considered extreme pressure, Amsoil performs better in both the Timken test and the 4-ball wear test, indicating it has better lubricity under extreme pressure conditions. I find it hard to believe that an oil which provides better wear protection under EP conditions would not also provide better wear protection under less severe conditions.
Your though of an engine running 24/7 being easier on oil in equipment is bs too, your pickup has never seen the constant load and duty cycle equipment sees for hours a day. Every day. The closest thing you could hope to achieve this is find the longest steepest hill and hook full payload to your truck and hold it flat to the floor every day for 8+ hours. It wouldn't make it 2 years before it blew up. ***** generators I used to take care of would run at 80%+ load everyday for years on end, shut down for periodic maintenance and oil changes and be off running again. Oil samples taken every 250 hours and sent out for lab testing. You're experiences have been annicdotal, and have zero evidence that you're running a superior product to any other actual oil manufacturer out there.