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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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