Some manufacturers use an in-vehicle system that displays a maintenance code or message rather than relying only on a fixed mileage or time schedule.
These systems can factor in actual driving conditions, such as engine load and trip patterns, to estimate when a service is due, rather than using a single fixed interval for every vehicle of that model.
Because these systems are manufacturer-specific and vary in how they work, MaintenanceSpec documents them generically here and treats the vehicle-specific implementation as its own structured rule type.
Where a vehicle uses this kind of system, its schedule will note that the applicable timing is determined by the code system rather than a fixed interval alone.
This page explains the service in general terms. It does not state a mileage or time interval, because the correct interval depends on your vehicle's manufacturer, model, year and configuration.
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