Well, I’ll throw in my two cents on the subject. I’m six months in on a one year oil test of sorts. Having said that, based on what I’ve seen so far I’ve made a decision on what oil I’ll be running into the foreseeable future. I’ve run VP, Motul 800 off road, Bel-Ray H1-R, and Castor 927. These oils have been run in a combination of string trimmers, blowers, and chainsaws at 40:1 with 93 octane non ethanol fuel. The one that’s impressed me the most is H1-R. Everything I’ve run it in is beautifully clean inside. Nice residual oil film, minimal carbon buildup on piston and combustion chamber. Spark screens and spark plugs are clean and clear. The VP and Motul oils were also excellent. Castor has superior lubricating properties even over esters but it leaves a fair bit more carbon deposits behind. I have a few more I wanna test but it’s not gonna change anything at this point. H1-R is my choice. Now excuse me while I don my flame suit.