Down here the timing belt replacement interval is (100,000kms or 60 months (5 years)). This is similiar to other vehicles sold and serviced in this market. I guess the reasoning is that it is what you would call Very Hot here for most of the year. Recent timing belt breakages around, and before the 100,000km mark, seem to bear out the wisdom of that replacement interval. Having lived in Ontario and Alberta for many years I could suggest that the cold might do just as much damage to a rubber belt (I doubt a block heater would do much to keep a timing belt warm).
