Preventive work is easy to postpone when trucks are earning and schedules are full. That is precisely when an unplanned stop creates the greatest disruption.
Mileage intervals do not suit every component. Engine hours, age, fault messages and the history of the individual vehicle also matter.
Compare planned and unplanned downtime. If the same fault repeats, the inspection regime needs changing rather than merely paying another invoice.
Model scenario: replacing a suspect alternator during a €280 planned service avoids a roadside failure costing €450 towing, €320 emergency labour and a €600 replacement vehicle. The comparison is €280 versus €1,370 plus customer disruption.
Official source: European Commission — Roadworthiness
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