Are you in Idaho? How hard will you be working your dad's tractor during the cold weather? If not much, I would just change the oil to match winter conditions and wait until warmer weather to tear into it. Any of today's oils is better than what was available in the late 1950's when that tractor was new and the owners manual was written. I'd use 10W-30 or 5W-30 non-synthetic for easier starting.
One easy way to remove the majority of sludge in a gas engine is to use something like Gunk Motor Flush at an oil change. The flush is a quart of solvents and detergents. Warm up the engine to operating temperature, the longer the better to warm up all the sludge. Add the quart of motor flush to the hot oil and idle the engine for 5 to 10 minutes, then drain the old oil, change the filter and the oil. After that you can decide how much sludge is left and if you need to tear into it.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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