Car Maintenance Schedule: Which Parts Wear Out When

A service schedule isn't an optional recommendation but a replacement plan built on the expected life of components. Follow it and you pay small predictable amounts at known intervals; ignore it and you pay large unpredictable ones at bad moments. The difference between the two approaches isn't only the total — it's when the bill arrives.

Three categories of maintenance

To organise it, divide what your car needs into three categories, each with a different logic:

Category	The logic	Examples
Periodic by distance	Replaced every set number of kilometres	Engine oil, filters, spark plugs
Periodic by time	Degrade even unused	Brake fluid, tyres, battery
On symptom	Inspected regularly, replaced when needed	Brake pads, suspension components, wipers

The common mistake is treating the second category with the logic of the first: someone who drives little assumes they're safe, when brake fluid and tyres age by time rather than distance.

The one item never to postpone

The timing belt or chain is the exception worth emphasising: its failure doesn't mean a fault, it can mean the engine is destroyed. Replacement intervals are set by the manufacturer for each model, and postponing it "a little" is the most expensive decision in car maintenance.

Know your car's interval specifically and write it down; don't rely on a general estimate or on what you were told about another model.

Keep a simple record

You don't need a complex system. A small notebook in the car or a note on your phone is enough, recording three things for each job: the date, the odometer reading, and exactly what was replaced. That record earns its keep twice over:

• It stops you replacing too early or too late, both of which cost.
• It raises your car's price when you sell — documented servicing is one of the clearest value-raisers, as covered in our valuation guide.

What to buy and from where

Not every part warrants the original. Filters, for instance, are fine from a known aftermarket brand, while sensors, timing belts and braking components warrant OEM — the detail is in OEM versus aftermarket.

And when buying, check against counterfeits particularly in filters, oils and spark plugs — see our counterfeit parts guide.

The check that costs nothing

Once a month, and before any journey: check the pressure on all four tyres and the spare, the engine oil level, the coolant level, and that all the lights work. Five minutes catches most of what otherwise becomes a breakdown on the road.

For buyers

Browse the parts listings to have what you need ready before the service is due rather than buying in a hurry on the day something fails.

In short

Divide maintenance into periodic by distance, periodic by time, and on symptom; know the timing belt interval for your specific model; and record the date, odometer and what was replaced every time.