In the late '60's, Dad bought a '61 International shortbed half-ton pickup with a 266 V8 engine. The guy who sold it to him was a trucker. He bought the truck used,and evidently the previous owner allowed the engine to sludge up heavily. So when the trucker bought the pickup,the switched it over to Rotella. Apparently the Rotella cut a lot of this sludge loose, and it plugged up the oil pump pickup and took out the bearings...rods, mains,and cams.
Dad bought the truck as a basket case and built it, and it ran for a lot of years afterwards after the rebuild. But I'd surely do as the other guys said,and drop the pan and covers and clean out any obvious sludge before running Rotella. And after switching, I'd change oil and filter on short hours afterwards, just for a bit of insurance.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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