Ryan,
I never said anything about adding a "maintenance dose" to the hydro did I?
I started using this stuff before any testing was done on garden tractors.
I guess you could say I was the tester for GT's.
I used the same stuff that originally was designed for engines.
All i can tell ya is. My 1450 had a very weak reverse relief valve and after adding the Cermax, I've got a good 75% back in reverse with less than 4 hours run time on it. And it just keeps getting better.
There's also nothing on that website about air tools, hand sanders, pillow blocks on furnace fans, air compressors, leaf blowers, walk behind snow blowers or weed eaters.
BUT, I've tried it on all the above with great results. So I guess I'm still testing, LOL