What a Car's Service History Really Tells You

A folder of service receipts is the first thing a seller hands you and the last thing most buyers actually read. It is worth reading, because a service history is not really evidence that a car was cared for. It is a timeline you can hold up against the car and see whether the two agree.

What to look for first

Start with the gaps. Consistent servicing at sensible intervals, by the same workshop or a few reputable ones, says somebody was paying attention. A three year hole in the middle says nobody was, and whatever wore out during those three years is still worn out now.

Then check the odometer against the dates. A car that covered 8,000 km a year for six years and then 40,000 km in the last twelve months has had a change of life recently, and it is fair to ask what it was.

The intervals worth knowing

Engine oil and filter is the one that matters most and the one most often stretched. Every 5,000 to 10,000 km depending on the car and the oil. Skipped oil changes are the single most common reason an otherwise healthy engine is tired at 150,000 km.

Air filters run 15,000 to 30,000 km, and coolant and transmission fluid both sit in the 50,000 to 100,000 km range. Spark plugs vary enormously by type, from 30,000 km to 100,000 km. Fuel filters land somewhere between 40,000 and 80,000 km.

Brake pads are usually 20,000 to 50,000 km and rotors 60,000 to 100,000 km, though both depend far more on how the car was driven than on how far it went.

Batteries last three to five years and then do not, regardless of what the book says.

The one to take seriously is the timing belt, typically 60,000 to 100,000 km or a fixed number of years, whichever arrives first. On many engines a belt that lets go while the engine is running destroys it. If a car is near or past its belt interval and there is no receipt, assume it has not been done and price the car accordingly.

What the history cannot tell you

A stamp in a book records that a car arrived at a workshop. It does not record what was found, what was declined, or what was done badly. Receipts are better than stamps because they list parts and hours.

None of it records accident damage, and none of it records what has happened since the last service. Plenty of well-serviced cars are sold precisely because something expensive has just started going wrong.

Use it as a negotiating position

This is where the reading pays for itself. If the belt is due, the tyres are half worn and the brakes are near the end, that is a known, dateable list of spending the next owner inherits. It is a specific number rather than a vague sense that the car needs work, and specific numbers are what move a price.

Ask for the full history, read it against the odometer, and have the car inspected so you know whether the paperwork and the metal are telling the same story.