The OP manual for the 1480 IH diesel combine with 436 or 466 engine states that #30 is perfered and they recommend oil change at 200 hrs. In the early / mid 80's IH said 15-40 was OK in those engines as long as you changed it at 100 hrs. Said the reason was that the IH cam lobe and lifter design would slowly destroy the viscosity improvers in the multi viscosity oil.
Otherwise, less cold start wear should happen with a multi vis oil in an engine designed for it.
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Today's Featured Article - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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