Systematic maintenance is the most common form of preventive maintenance.

It is defined by its rigid, non-negotiable schedule.

Maintenance actions are carried out based on a predetermined calendar or usage counter, without any prior inspection to determine the actual condition of the component.

The key example that everyone is familiar with is the scheduled oil change for a car.

The manufacturer recommends changing the oil every 10,000 miles or every year, whichever comes first.

A mechanic following this plan will change the oil regardless of whether it looks clean or dirty.

The decision is based solely on the fixed interval.

This approach is simple to plan and manage.

It ensures a baseline level of care and can be effective for components with a predictable wear pattern.

However, its main drawback is a potential lack of efficiency.

It can lead to 'over-maintaining' by replacing parts that are still in good condition, or 'under-maintaining' if a component fails before its scheduled replacement date due to unusually harsh operating conditions.