For the past several years I have been using Cub Cadet Low Ash 30WT and Kohler 30WT without any problems in my K301.
This year picked up a 782 with a KT17 II which has Shell Rotella 15W40 in it. Ran fine and did not burn any oil. I recently changed the oil, added a oil filter and put in Amsoil SAE 10w-30/30WT 4 cycle oil. This oil is marketed to be a synthetic straight 30WT oil that has the viscosity of a 10w30 oil when cold.
Between the hot summer temps and my hilly yard I wanted to protect the KT17 as best I could. So far so good.
Chris
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