Between my farm tractors and the diesel pickup truck, my little buggy and my wife's Suburban, I tend to go through about 20 gallons of T6 as well and adding in the hydraulic oil from the tractors, total is about 90 gallons every year so I purchased a while ago, a smaller waste oil furnace and I burn my own for heat and always looking for more actually.
I run T6 5-40 in everything with an engine. Gas or diesel makes no difference. Been doing that for years now and never had an issue with any of them, despite what the Internet says about using diesel oil in a gas engine. I believe that is just Internet phooey.
I do use top quality filters however, no Walmart or discount
parts filters here. Kubota's get Kubota filters and the buggy's get premium Wix.