How Long Does Lawn Mower Oil Usually Last?
Lawn mowers need a bit of maintenance once you get them home, and benefit from yearly maintenance as well — including the oil inside. Don't make the mistake of waiting for the engine to start acting up to change the oil, as the damage may already be done by then. Most gas-powered lawn mowers need an oil change after the first five hours of use. After that, change the oil every 50 hours or once a season, whichever your mower experiences first.
The first change comes early because the initial break-in period can introduce fine wear particles into the oil. Over time, heat, dirt, and air also darken the oil, which prevents it from effectively lubricating the engine components.
Differing operating conditions can wear out oil faster than the standard schedule assumes. High temperatures, heavy dust, wet grass, or rough land might require you to change the oil more often than you initially expected. Hours also add up quickly if you're mowing more than usual, or if you lend your equipment to your neighbor or friends once in a while so they can mow their lawn. It's best to track the total hours you use your mower for instead of relying on the calendar alone, and change the oil once you hit 50 hours, even if the season isn't over.
There are some exceptions to the 50-hour oil change rule
Though the 50-hour oil change schedule covers most gas-powered residential mowers, it doesn't hold true for all types of lawn mowers. For instance, if you have a riding lawn mower, you should change the oil every 100 hours, as it has a larger engine and a different oil filter system. The same goes for zero-turn models, which often run 50 to 100 (or more) hours between changes. Diesel engines can run even longer, clocking 100 to 200 hours before requiring an oil change.
It can vary by brand as well, as some of Jacobsen's gas models need an oil change after the first eight hours and then yearly. Its diesel engines need an oil change after 50 hours and then every 100 hours of operation or yearly. On the other hand, 2-stroke units require no oil changes as they don't have conventional crankcase oil reservoirs. In a similar vein, electric mowers have no engine and use no engine oil, which is one reason the electric versus gas lawn mower debate is worth a look if you'd rather not spend a lot of time on your lawn mower's tune-up or maintenance.
Whatever type of mower you have, the exact interval depends on the engine and model. So, before your next oil change, check your mower's manual or the manufacturer's website to confirm the schedule, especially if you aren't sure about the type of lawn mower you're dealing with.