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Jim..... ..boy, almost missed your question. I doubt that you'd find the N-Tractor's hose mounted thermostat at your local "pep boys". NAPA maybe, they'd order it for you I'm sure. Check some of the sponsors of this excellent N-Board. About $15. N's really need a thermostat, summer or winter. The oil needs to get hot enuff to vaporize the water that is a byproduct of combustion, otherwize the oil and engine innerds get all gunked up. I use valvoline 10-40 in my 8N all year long. Of course we seldom see below 20 degrees, which is cold enuff. I think 5W-30 might be a little on the thin side unless your trying to start at minus 30, at which time, you're going to have other problems, like weak battery, low sparkies, gas that won't gas. Don't forget, oil besides being a lubricant, it is also a "coolant". If you're just trying to get the tractor to start so you can plow the driveway, a 30 min job, or to muckbucket with the front loader for 1 hr. 5W-30 probably be ok. But if you were planning to do some serious heavy duty work, 5W-30 might just be too thin. But I sure wouldn't plan on putting 50wt oil in (grin)..... ...Dell
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