More time running the mowers and much less time changing oil. More time making money less time spending money, justifies Ams Oil. On top of that you get many more hours running time before you need a engine over haul. No extra cost because less oil changes making more run time with better gas mileage. Just try it on one of your mowers and you will see a big advantage. Things have come a long ways in lubrications so get with the modern times of today. Try it you will like it, its 2014 not 1950 anymore.
No, that's where you're wrong. Extending oil changes because you are using a synthetic should not be done. Every manufacturer of lawn mower engines and others warns people not to do that, it's a misconception.
Your oil in a mower at 50 hours regardless of type is going to be dirty and need to be changed. Synthetic oil was developed for use in an automobile. Go ahead and change your synthetic in your car or truck along with a new air filter and drive it down the road a 100 miles and return and check your air filter and see what you find, probably very little if any dirt or debris, now do the same to your mower, run it for a day and see what you find.
You'll find dirt, dust, grass and god only knows what and my guess is the air filter isn't catching all of what goes in and guess where it goes. I'm sorry but your claims like the oil company's are not justified when it comes to a lawn mower, a car maybe. Frequent oil and oil filter changes with a good detergent oil to your mower engine is the best way to keep a clean well working engine.