A maintenance schedule usually covers several fluids, and each one carries its own interval and its own action. Some are replaced, some are only inspected, and some are treated as filled for the life of the unit on a given model.
Common entries are engine oil, engine coolant, brake fluid, transmission fluid, and on the drivetrains that use them, differential and transfer case fluid. Vehicles with hydraulic power steering have a fluid for it; those with electric assist do not. Washer fluid normally appears as a level check.
The action matters as much as the timing. An inspection asks a technician to look at condition and level, a replacement calls for the old fluid to be drained and new fluid installed, and a level check is a top up if needed. Reading a distance figure without the action attached to it gives the wrong picture of the work.
Manufacturers name the fluid specification required for each system, and products are not interchangeable by category name alone. Two vehicles can both list an automatic transmission fluid change and call for different fluids. The specification travels with the interval in the source document, so MaintenanceSpec keeps them together.
Some fluids have one point for the first service and a different repeating interval afterwards. Where a manufacturer writes the rule that way, the first occurrence and the recurring interval are recorded separately rather than averaged into a single number.
Which fluids appear, in what action, and at which point depends on your model, year and drivetrain.
Find my vehicleAnswers that apply generally. Timing for a specific car comes from its own schedule.
