Hi Aoife,

The average annual mileage for a diesel car in Ireland is 15,000 miles (petrol cars generally travel less each year), so the average for a 2013 car would be 150,000 miles. That suggests there's nothing unusual about the Astra's mileage. However, more important than that are the car's condition and its service history. You want to see a full record of regular oil changes at the very least.

If in any doubt, try to get the car looked at by a trusted mechanic.