15-40 year round in three diesel tractors. 5-30 in my old gas tractor that I don't work hard. 5-30 synthetic in my gas car and HD gas pickup. I live in mid Michigan and it does get cold. I use two of the diesels during the winter. My daily user just has a preheater and has started at -15 degrees with no problem. The other has a preheater but I plug it in for an hour or do before I start it in the cold.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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