Join Date: Jan 2003
Location: Escondido, California
In reality, there isn't a whole lot of difference in viscosity between 75W or 80W and the exact viscosity we use in our axles is not critical. In theory however, the 75W rating would be a little better in the coldest conditions than 80W would but not by a significant margin. A 75W-90 or 80W-90 would be fine for extremely cold conditions.
When you have a choice, buy American made.
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