Kohler Magnum SAE30 engine oil is made by the Warren Oil Co. They also make the Traveller brand of oil sold by Tractor Supply Co. Kohler oil has 1500 parts per million of ZDDP, the zinc phosphor additive which lubricates high friction parts on older engine designs. Use of ZDDP was reduced to about 600 PPM (Pennzoil and Valvoline) or less in motor oils engineered for vehicles with catalytic converters because the phosphates coat and thus harm the converter. Shell Rotella SAE30 has 1000 PPM of ZDDP.
I believe the Cub Cadet Low Ash oil is a relabeled Kohler oil or vice-versa.
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