How often should you service a lawn mower?
Once a year.
Best month: March (Northern Hemisphere)
Only some homes need this one. It is optional on the checklist and starts switched off in the tracker.
How to do it
Change the oil, replace the spark plug and air filter, and sharpen or replace the blade before the first cut.
Why it matters
A dull blade tears grass, and the engine starts first time with fresh parts.
Recommended interval: once a year, per Briggs & Stratton.
General guidance for a typical home; the manufacturer's instructions come first.