Preventive maintenance services vehicles and equipment on a schedule, before something fails.
The saving is not the repair bill
A failure costs the repair, and then costs the day: appointments missed, a technician idle, work moved, customers told.
That second cost is usually several times the first and appears nowhere in the maintenance budget, which is why maintenance looks like a cost rather than a saving — see throughput and lead time.
What it covers
Vehicles on manufacturer intervals — see fleet management.
Tools and equipment on their own schedules, including calibration where accuracy matters.
Safety equipment inspected on the interval its certification requires, which is generally not optional.
Making it happen
Scheduled like a job, in the same system, with someone responsible. Maintenance that depends on a quiet week does not occur, because there are no quiet weeks.
The usual approach is booking it into the least disruptive slot months ahead rather than waiting for availability.
Records
Per asset, with dates and what was done. It supports warranty claims, raises resale value, and is what makes replacement timing a decision rather than a surprise — see useful life and salvage value.
The same idea sold to customers
A maintenance agreement is this service offered to the customer, and the argument is identical: scheduled servicing costs less than the failure it prevents. See service agreements.
Businesses that run their own equipment to failure make that argument less convincingly.