How often should I change the engine oil in my T100 Series Lawn Tractor?
You should change the engine oil after the first five hours of operation, and then every 50 hours thereafter. Before each use, always check the oil level as instructed in the Engine Operator's Manual. The oil filter should also be changed at every oil change interval. (Page 21)
From the official Craftsman T100 Series Lawn Tractor manual, page 21
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