timing belt needs to be replaced evry 50,00km daw, malapit na din yan if the mileage is true. palitan mo na din for ur peace of mind, hirap na kc kung tipidtipid tapos naputulan ka, baba pa makina mo, as for the calibration, just observe the pajero, anyway u can take it to a calibration center for a free estimate, it could be as low as 2ooopeso to a hi of 10,000pesoses....basta suggest ko lang, replace timing belt agad lalo na if u don't know the owner...