A friend of mine, a mechanic, is kept busy by forgetful people.
Today there are "extended drain intervals" and "long life" filters available, but when one forgets to tend to these matters in a timely manner, dirt engine, and costly repairs end up being the result.
Did you ever notice that there is a "constant" here? Namely that humans forget things.
What kind of reminder "system" do you use to ensure that important things, like car care, don't get overlooked?