the biocide I can see if it sits for a bit. however you brought up another question I had. an old Case Construction tractor I used from time to time never had a working fuel gauge, so occasionally it would run out of fuel......which was a serious pain in the ass to get started once you got fresh fuel in it. (crack open fuel injector lines, ether fluid to crank it just a bit etc.) obviously you are NOT supposed to use ether on the new stuff, and I don't believe you can get to the fuel feed lines as easy. so IF this were to happen on my tractor, would it be as simple as just putting fuel in it and starting it? or is there a fuel system bleed procedure?If you are getting advice on additives, make sure it applies to the type of fuel injection system in the 60 series tractors, high pressure common rail, direct injection etc. So far no dealer has recommended anything specific, and mine has said nothing needed, but if you are OCD as I am you may want to add a biocide in the summer (or maybe year round in Texas?) and something to inhibit gelling in the winter.