Citat fra Haynes: "It is strongly recommended that the timing belt renewal interval is reduced to 60.000 km on vehicles which are subjected to intensive use, ie mainly short journeyes or a lot of stop-start driving. The actual belt renewal interval is therefore very much up to the individual owner, but bear in mind that severe engine damage will result if the belt breaks".
Haynes Service and Repair Manual Peugeot 306 Petrol and Diesel Side 1B • 3