Aircraft use straight weight oils today, but they should be pre-heated up to 45F before starting.
If you keep the tractor in a 45F or higher temp, you can use straight 30wt oil up to 100F. All 30wt oils are rated are 111CTs @ 100.
The best straight weight oil is AeroShell 65, which is 30wt oil with additive package to help tappets keep lubed. It also is a detergent and will suspend carbon until changing with the filter.
The only downside to multi-vis is their lower ability to transfer heat away from the engine components, which is simply a function of their ability to tolerate a wide temp span.
I use a lot of straight weight oil because I'm rarely in very cold conditions. If heat rejection is a problem, stick with straight weight. If the tractor is regularly used below 40F, multi-vis will be better. It's all about temp gradients.
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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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