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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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