Figuring out how often to change lower unit oil
If you're trying to figure out how often to change lower unit oil, the general rule of thumb for most boaters is every 100 hours of engine time or once a year, whichever happens to come first. It's one of those maintenance tasks that's easy to put off, but keeping your gearcase lubricated is pretty much the only thing standing between a smooth day on the water and a multi-thousand-dollar repair bill. ...