In Reply to: Gear box lube posted by Farmer Brown on March 12, 2024 at 08:00:45:
I've used Napa Premium 80w-90 gear oil for decades in my '82 Covington Cutter and 2004 Land Pride rotary cutters and never had a problem with the gear box in either mower. You can get it in quart bottles. I think that Tractor Supply has their version but you have to buy it in a 6-pack.