Im just NOT a big fan of grease or oil on top of the battery terminals which may warm and ooze down BETWEEN the battery posts and the battery terminal connectors i.e. the place where it can come in between and form an electrical insulation barrier between the battery post and the cable. I prefer that area (the electrical junction) be lead to lead WITHOUT oil or grease or vaseline which isnt as good of an electrical conductor (its more like insulation) as lead. I dont like any resistive less conductive material (grease or oil or vaseline) getting between the battery post and the lead cable connector.
Before anyone has a calf SURE it helps reduce corrosion because it keeps oxygen and acidic vapor and hydrogen gas off the terminals and battery posts AND SURE it stops that ugly unsightly destructive white powdery corrosion. If a body dabs grease over the terminals SURE it keeps oxygen away buttttttttt I just dont want any getting between the post and connector.
As a used tractor dealer and farmer having dealt with literally hundreds of batteries IVE HAD THE BEST LUCK USING THOSE FELT WASHERS UNDER THE TERMINALS WITH A LIGHT SPRAY (and I avoid right on top where it may get between post and terminals) OF THAT RED BATTERY TERMINAL PROTECTIVE SPRAY..........When Ive done that I NEVER HAD ANY CORROSION OR CONNECTION PROBLEMS EVERRRRRRRRRRRRRRRRRRRRRRRR
So its your tractor and yall are welcome to your own methods of preventing battery terminal corrosion and Im NOT saying coating with grease or vaseline doesnt prevent corrosion (cuz it does) Im ONLY saying In my opinion (per my own experience and the reasons above) its better to use the felt washers underneath and a light (NOT right on top) spray of battery terminal anti corrosive........
That my story and my method (and experience and reasoning) n Ima stickin to it lol
PS on that 4020 Id remove, clean n wire brush bright n re atatch each n every battery and terminal and solenoid and starter connection
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