Thicker is better but there isn't a set number for everything. That 250 wt would be great in the old Dubuque steering boxes. If you lived in Nevada it would be good in the tranny and final drives too. It would be a little overboard for most places in cold weather.
I actually have straight Lucas Hub Oil in the final drives on one of my M's. It's probably just as thick as that #250 is. It isn't yellow metal friendly and that's the only reason it isn't in the steering box. For it I use 140 wt blended with cornhead grease.
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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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