How often should I change the engine oil on the T100?
The engine oil should be changed after the first five hours of operation, and then every 50 hours thereafter. The oil filter, if equipped, should also be replaced at every oil change interval. Refer to the separate Engine Operator's Manual for the proper oil quantity and viscosity. (Page 21)
From the official Craftsman T100 Series Lawn Tractor manual, page 21
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