The lube table in my Owner's Manual sez to change oil as needed. I assume that to mean if there's discoloration or moisture found in it. The filter is recommended to be changed every 100 hours.
I go by the hour meter on the Cub. Without an hour meter I figure if it averages over the year to about 8 hour weeks, say 4 2 hour days per week on average, that translates to 12 weeks to get 100 hours. Depending on climate and acreage such as my little 2 acres with an orchard in mild W Oregon, the time really racks up. Even now with some warm weather a little early, the lawn is already needing mowing. The filter gets changed about once a year and is cheap insurance.
It goes on empty, and as others have said, the charge pumps fills it pretty fast.
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