What a scheduled preventive maintenance calendar is
It is the system that defines, for each vehicle in your fleet, what work it needs to receive and when. The smallest unit is the task (oil change, tire rotation, filter change). Tasks are grouped into services (10,000 km service, major service at 50,000 km). Services are organized into a maintenance plan per vehicle model.
The full Plan → Service → Task hierarchy is the backbone of preventive maintenance, and it is configured inside the Maintenance module. Without that structure, you don’t have a calendar: you have a to-do list.
The two dimensions of preventive maintenance: time vs. mileage
Each preventive task is set off by one of two possible triggers:
By time. Every X months or X days since the last job. It applies to tasks that depend on the passage of time rather than usage (battery replacement, fluid check, general inspection).
By mileage. Every X kilometers driven. It applies to tasks that depend on wear from use (oil, filters, brakes, tires).
Most tasks have both triggers configured and are carried out according to whichever comes first. A vehicle that drives little will get its service by time. A vehicle that drives a lot will get it by mileage. If you configure only one trigger, you will miss half of the fleet.
How to build a calendar that gets followed: 5 rules
Rule 1: Calibrate intervals to real usage, not to the manufacturer’s manual.
The manufacturer’s manual assumes average conditions. Your fleet has specific conditions: typical load, type of route, climate, local fuel quality. If you copy the intervals from the manual, your vehicles will fail sooner or you will be spending more than necessary. Make the adjustment based on the history of actual failures in the first 6 months.
Rule 2: Every preventive task is born as a ticket, not as a reminder.
The difference is huge. A reminder gets ignored; a ticket with a due date and an owner gets done. The system has to generate the Preventive ticket when the interval is reached, without anyone having to remember.
Rule 3: Differentiate due items by urgency with a green/yellow/red indicator.
Not all preventive jobs are equal. An oil change 500 km overdue is green. 2,000 km overdue is yellow. 5,000 km overdue is red and starts to create a risk of failure. The system has to show all three states so the manager knows what to prioritize.
Rule 4: Closing a Preventive ticket requires evidence.
A task closed without the shop invoice or the details of the work performed is not considered complete. Traceability is what later lets you file warranty claims and defend the quality of your preventive work in an audit.
Rule 5: Review the plan quarterly.
The plan you built on day one will not be the right plan in year two. Operations change, models change, suppliers change. A quarterly review with real data is what keeps the calendar alive.
Mistakes that kill the preventive calendar
If preventive maintenance is not being done, it is almost always because of one of these five mistakes:
- Preventive tickets opened too late. If the ticket is generated on the due date itself, there is no time to coordinate the shop and the driver. It has to be opened days in advance, depending on the type of task.
- There is no clear rule for which shop each ticket goes to. If every time a Preventive ticket is opened you have to discuss where the work will be done, that friction slows the flow. Define in writing which shop serves each base and each type of task, so assigning it is a click and not a decision.
- Tasks are too generic. A service that says “20,000 km service” doesn’t tell the mechanic what to do. Each task has to be broken down in enough detail to be carried out without asking.
- Nobody tells the driver. If drivers don’t find out that their unit has a pending preventive job, they will keep operating until someone stops them. The notice has to be part of the base supervisor’s daily routine.
- Compliance is not measured. Without a compliance metric there is no way to improve the plan. It has to be a monthly KPI for the fleet manager.
How to measure whether your calendar is working
Three metrics you need to look at every month:
- Preventive compliance rate. Preventive tickets closed on time over Preventive tickets generated. A managed fleet is between 85% and 95%. Below 70%, the calendar is not operating, it is stalled.
- Average days overdue per Preventive ticket. If the average grows month after month, you are heading toward corrective mode. If it decreases, the system is maturing.
- Corrective / Preventive ratio. A healthy fleet closes between 2 and 4 preventive tickets for every corrective one. If the ratio is reversed, the calendar has lost control.
These three metrics live in the maintenance manager’s dashboard and are reported to the operations director every month.
What a preventive calendar looks like for 3 typical models
To make the Plan → Service → Task hierarchy concrete, here is how preventive maintenance is configured for three representative models in a mid-sized mixed fleet:
Model A — Diesel light commercial vehicle for urban use (delivery)
- 10,000 km / 6-month service: oil and filter, fluid level check, tire rotation, lights and brakes check. 8 tasks, about 2 hours.
- 20,000 km / 12-month service: all of the above plus air filter, full brake inspection, battery and alternator check. 14 tasks.
- 60,000 km / 36-month service: major service with fluid replacement, timing belt if applicable, front suspension inspection. 22 tasks.
Model B — 4×4 diesel pickup for mixed urban/highway use
- 8,000 km / 6-month service, with a shorter interval due to demanding operation: premium oil, filter, suspension check.
- 30,000 km / 12-month service: all of the above plus fuel and air filters, brake and clutch inspection.
- 80,000 km / 36-month service: major service plus injector and turbo diagnostics.
Model C — Long-haul light truck
- 15,000 km service, with no time trigger because mileage always triggers first: heavy-duty oil, filter, tire check in 6 positions.
- 50,000 km service: in-depth inspection of the transmission, differential and complete brake system.
- 150,000 km service: major service with fluid replacement, engine and transmission inspection, chassis check.
For each model, the plan is built only once in the Maintenance module and stays linked to that model in the catalog. Configuring the three plans for a new fleet takes no more than one day of work if the manufacturer’s data is at hand.
How VEC Fleet implements the preventive calendar
- Maintenance Plan → Service → Task configurable by vehicle model from the Maintenance module.
- Time and mileage triggers, with the vehicle’s Meter as the source of distance driven.
- Automatic generation of Preventive tickets as the due date approaches.
- Visual calendar with upcoming expirations and preventive jobs marked with the letter V or P, a green/yellow/red indicator and the letter T when a ticket is already open.
- Network of suppliers and shops loaded in the system, to assign the ticket to the right shop without leaving the platform.
- Ticket closing with the job documentation attached, which is what validates the work and backs up the warranty claim.
- Native reports on compliance by base, by model and by manager.
→ Explore the Maintenance module
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Frequently asked questions
What is the difference between preventive maintenance and scheduled maintenance?
In practice they are synonyms. Some manuals separate “preventive” (generic, avoiding failures) from “scheduled” (carried out at defined intervals). In fleet management they are used interchangeably to refer to the same concept: planned work done before the vehicle fails.
How often should I review the maintenance plan?
Every 3 months as a routine, and whenever you add a new vehicle model or change service provider. The plan is a living thing: adjusting it is part of the job, not an exception.
How many days before the due date should the Preventive ticket be opened?
Between 7 and 21 days, depending on the type of task and the capacity of your shop network. Simple tasks like an oil change or a tire rotation need less lead time; those that require coordination or ordered parts need the full three weeks.
What happens if a vehicle misses its preventive maintenance date?
The ticket stays open with an overdue flag, and the calendar indicator turns from green to yellow and then to red depending on the days or kilometers of delay. It is recorded, and that is what gets reviewed later in the monthly compliance audit.
How do I handle preventive maintenance in a fleet with many different models?
Each model has its own Maintenance Plan, built only once and linked to that model in the catalog. The heavy lifting is the initial loading of the plans; after that, adding units of an already configured model is much faster than starting from scratch.
