Hi, I own a 1989 Volvo 740 GLE - 16 Valve. The timming belt was last replaced at 96,000 km and the car has now done 135,000 km. At how many thousand kilometres should the timming belt be replaced on the 16 Valve Volvo 4 clylinder (B234F)? Also what else should be replaced at this time to avoid any unpleasent things happening to that lovely engine? Peter.