mrreaz wrote:Hi,
Need some advice - is there a specific mileage by which a vehicle's thermostat should be replaced?
you should consult your owners manual - it will give specific intervals for changing all fluids - engine oil- transmission oil brake fluid and coolant.
in the absence of any sort of owners manual - its usually engine coolant is replaced every 2 yrs or 50,000kms or so -
my advice is to replace it one time when youre replacing your coolant.
buy back the OEM thermostat - they're designed to fail in the open position - if they do fail.
same goes for the rad cap.
dont forget to bleed the radiator properly.
good luck.