per Google:
winter
In a 10w-40 for example the 10w bit (W = winter, not weight or watt or anything else for that matter) simply means that the oil must have a certain maximum viscosity/flow at low temperature. The lower the "W" number the better the oil's cold temperature/cold start performance.
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1968 Cub Cadet 124 with deck and #2 Trailer
1965 IH Scout 80 Champagne Edition
1968 IH Travelall 4x4 and factory PTO winch
1955 IH Refrigerator
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