Well this is the cars community..

Or a lawnmower. Personally, I change my push mower’s oil every 3,000 miles /s

Edit: I did the math for this, actually. For one acre of land, assuming you had a 4ft wide push mower, it would take about 2.05 miles of walking per acre of land, for complete coverage, with no overlap. I prefer to do a 25% overlap though, so let’s increase that to 3 miles per acre at most.

This means you would need to do 1,000 acres of push mowing before changing the oil in a push mower at this rate. This is about 757 American football fields, 1.56 square miles, or about yay big: https://i.postimg.cc/qRrfdqdn/IMG-1199.jpg