The oil you use in the filler Plug is for the transmission and the hydraulics and it takes 24 quarts of Multi-grade 10W/30 this is much better for cold weather, it is OK for summer as well. Whatever you do NEVER use Diesel or kerosene in the housing as you can't fully drain it out. Ferguson makes a point of saying this in the Service Manual. Any diesel or kero left in there will immediately dilute the new oil. The oil should be changed every 12 months. Replace the rubber boots at the bottom of the Gear Levers as this is the usual place for water to enter. When you pour oil into the Transmission, only pour 2 gallons at a time and then leave it for 15 mins to level out before you add the next lot. This is to prevent the oil level getting too high in the transmission and running through the oil seal into the Clutch Housing and getting onto the Clutch and the Starter. The small "Cap" that you saw is a breather. If you need more written info about all this, email me direct at the address below, tell me what you need and I will send it...John(UK)..email@example.com
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