ok, I might get some flak on this but I run 15w-40 in all my equipment and tractors, never had a single issue what so ever, its also amsoil which helps dissipate heat which these kohler make a lot of. I have it in my 682,123,122, and soon to be in my 1450 when I decide to, plus in the bigger tractors and equipment. as far as hydros and gear drives yes hy tran is the best choice
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