It not just the two-stroke-cycle Detroits. Many diesels mention a single grade 30W oil as the best choice when temps allow. Even my Chevy diesel trucks. Just back in the 80s, most tractor companies listed straight 30W as the preferred oil when temperatures allowed.
Deere Co. told us not to use any multi-visc oil in diesel tractors in the 80s. Only 30W or 10W. That until the TorqGuard Supreme 15W-40 came out.
Even my little Chevy diesel Chevette states in the manual - when used in temps 32 F or warmer, single-grade 30W is the preferred oil. It also states that for any continuous sustained driving -SAE 30W is preferred over any multi-visc oil. Manuals for my trucks say the same.
Detroit two-stroke-cycle diesels are one of the few, however, that have never recommended any mutligrade.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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