How often should I change the oil in my standby generator?

Change the oil in a standby generator according to the manufacturer’s schedule based on engine hours and time in service, not by the calendar alone. The biggest driver is actual run time during outages and the unit’s weekly exercise cycle, since heat and combustion byproducts break oil down faster than sitting idle. In our field work around the Lake Tapps area, we also see dusty sites, cold starts, and long low‑load runs shorten safe intervals. A simple technician rule of thumb: clean oil is cheap insurance for engine life, while skipped changes usually show up first as hard starts and rising noise.

Change it sooner if you notice any of the following:

• Engine hours jumped after an extended outage
• Oil on the dipstick looks dark, smells burnt, or feels gritty
• The controller shows a maintenance reminder or fault related to service
• Your warranty or maintenance plan calls for an earlier interval

Always follow the owner’s manual and log run hours so your next oil change is tied to actual use. <br/> Updated: 2026-04-02 <br/> Need help in Lake Tapps, WA? Call (425) 616-3318 or book online.