"It's got 120,000 miles on it — stay away." Advice like this is common and understandable, but it is also overly simplistic. High mileage is one factor among many, and a well-maintained high-mileage car is frequently a better buy than a low-mileage car that has been neglected.
Here is how to think about it properly.
Mileage in Context: Annual Average
The key figure to understand is annual mileage. The UK average is roughly 7,000–8,000 miles per year, though motorway drivers and business users regularly cover 15,000–20,000 miles annually.
A car with 70,000 miles on a seven-year-old car works out at 10,000 miles per year — entirely within normal range. The same mileage on a three-year-old car (23,000 miles per year) is harder to explain and warrants questions about the car's use.
Conversely, a car with only 20,000 miles on a twelve-year-old car — roughly 1,700 miles per year — sounds appealing but raises its own concerns. Very low annual mileage often means the car has been sitting for long periods, which causes its own issues: degraded seals and rubber, corrosion, stale fuel in the system, and brakes that seize on.
Service History Matters More Than Mileage
A car with 140,000 miles and a full documented service history is almost always a better proposition than a car with 70,000 miles and no history whatsoever. Service history tells you the oil has been changed regularly, major maintenance has been carried out, and someone cared about the car.
Without service history on a high-mileage car, you simply do not know whether the engine has had regular oil changes, when the cambelt was last replaced, or whether known common faults have been addressed. You are buying blind.
When you look at high-mileage cars, always ask: "Do you have the service book and receipts?" If the answer is no, price this in.
Engine Type and Mileage Tolerance
Different engines wear at different rates. Diesel engines, particularly those used regularly for long motorway journeys, are often in better condition at 150,000 miles than a petrol engine used predominantly for short urban journeys at 60,000 miles.
Large-capacity naturally aspirated petrol engines (1.6–2.0 litre, non-turbocharged) from reliable manufacturers are routinely seen running well beyond 150,000 miles with proper maintenance. Small turbocharged engines — now common across most manufacturers — can show significant wear by 100,000 miles if oil change intervals have been extended.
Hybrid vehicles introduce a different consideration: battery degradation. Ask for evidence of battery health on any hybrid over 80,000 miles.
What to Check on a High-Mileage Car
On any car beyond 80,000 miles, check the following specifically:
Cambelt (if applicable): The most critical item. A snapped cambelt on an interference engine causes immediate, catastrophic engine damage. If the service history does not show a change within the manufacturer's recommended interval (typically 60,000–80,000 miles or five years), assume it needs doing and factor the cost (£300–£800) into your offer.
Gearbox: Manual gearboxes are generally durable at high mileage. Automatic and CVT gearboxes are more sensitive to neglect. Ask when the gearbox oil was last changed.
Turbocharger: On turbocharged cars, listen for a whine or surge under acceleration, which can indicate bearing wear.
Suspension bushes and wear items: High-mileage cars almost invariably need some suspension attention. Clunks over bumps, vague steering, or uneven tyre wear are signs these need replacing.
Coolant and oil condition: Milky or foamy oil or coolant indicates a head gasket issue — a potentially expensive repair.
When High Mileage Is Just a Number
A ten-year-old, 130,000-mile Toyota with full service history, fresh cambelt, and a clean MOT history is a reliable and rational purchase for many buyers. The mileage alone should not deter you.
Approach every car as a combination of factors: mileage, service history, usage type, age, manufacturer reputation for reliability, and the evidence of how well the car has been looked after. High mileage is a data point — not a verdict.