Write the date and current machine hours on every filter you change.
This way anyone who checks the engine compartment knows when maintenance was last done without searching through stacks of dusty notebooks or scrolling through old messages on their phones.
*Bonus points apply if you ever sell the machine. The next owner will really appreciate it.
Video link: https://stellar-mechanics-v1682368842.websitepro-cdn.com/wp-content/uploads/2023/02/February_-Mark-Your-Filters.mp4