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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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