Ever wondered what happens to a car odometer when a car reaches on million kilometres? Some of them flick back over to zero but for Harry Sirros' 2004 Land Rover Discovery turbo-diesel, the odometer is stuck on 999,999km.

Sirros now uses the short-range trip-meter to track his Disco's servicing requirements.

The Land Rover Discovery Td5 is probably the last car you'd expect to reach that milestone without falling to pieces, not least because it is driven by a former Qantas 747 pilot almost daily between Sydney and Bowral.

The million-kilometre Land Rover Discovery has also been around Australia at least three times.