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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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