If you never use your tractor when it's too cold, or too hot for the oil, much depends on the anti-wear additive package and little else.
If you want the best metal-wear protection, buy a racing, or off-road diesel oil and not oil made for highway use vehicles. That because many anti-wear ingredients were lowered in 2009 for highway oils.
Also depends if petro-based, or non-petro-based.
The oils that can sustain the highest temps - are sythetic single or multi-grades, and some petro-based single grades.
The oils that work best in extreme cold are multi-visc sythetics.
The other issue is the use of polymers to make multi-visc oils from petroleum. They can cause deposits on piston rings, whereas sythetic multi oils do not (generally speaking).
Now, if you never want to think about temps and your oil, and IF you might have to use your tractor at 30 below zero F, or 110 F above . . . buy a sythetic off-road diesel oil like 0W-50, 5W-40 or OW-40 and you'll never have to think about it again. Deere, Delo, Shell, and many other places sell it.
For example, Deere Plus 50 synthetic-base oil. It's a 0W-40 rated oil. Has more anti-wear additives then highway EPA rated oil. Has a working temperature range from 40 below zero F, up to 122 degrees F.
Petro-based single-grade 30W oil is fine, but can damage your engine if you start it below 20 degrees F.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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