At what millage I have to change the timing belt.

timing belt change is recommended at 100.000 klms, so now would be a good time to consider changing it
A professional job with the aim of another 100.000 trouble free klms will include the belt, idler pulleys , cam and crank shaft seals and if fitted a hydraulic tensioner
The reason for the extra replacements is this
all those components have covered the same distance as the belt and as oil is the biggest destroyer of belts, do the job once , do it properly( idler pulley bearings are well worn, seals will have lost the ability to seal properly and will fail within the next 50.000 klms )
get quotes from accredited service shops that have experienced on your make of vehicle
The price will be around $800.00.00 with a time of around 4.5 hours

Personally, I wouldn't go much past 80000 miles before changing timing belts. Some folks would have you change them even earlier.

for the most part its just basic maintenance but after a certain millage you should have the timing belt replaced to avoid major engine damage same goes with the transmission a fluid and filter should be done after a certain millage. check your owners manual for the millage and servece

Factory (most) recommends every 60k miles (i.e. 60k, 120k, 180k...). But as we all know, lifespan of belts (and all other parts) varies, depending on the driving conditions, weather, maintenance etc. Best thing to do is to do a visual check, and look for signs of slack, cracks etc. I used to drive a civic and never changed my timing belt till around 130k miles, and that's after it was submerged in a flashflood. Although I'd never recommend doing what I did, but if you're a little mechanically sound - periodically checking your belt is what I'd recommend. It doesn't mean that ritually replacing timing belts every 60k miles'll guarantee it'll never break ;-)<!-- from fixya rte -->

Most manufactures recommend changing Timing Belts @ 100k Kilometers. For low milage vehicles, 7 years is usually the limit. It would be wise to change it soon so that you don't suffer expensive repairs if it does break.

At that millage you will need to change the oil, transmission fluid and engine coolant. You should also possibly change the timing belt and water pump. Check you owners manual for any additional services.

The interval for replacement is 60,000 miles on that model.
If you do not know the last time it was changed, it would be a good idea to do it so you do not risk getting stranded.

The engine is NOT an interference engine, so the engine will not be damaged if the belt breaks; you will just need a tow truck to get it somewhere to install a new belt.

It is due, think about it. Its 5 years old, and Toyota recommends 80,000 miles for Timing Belt replacement. And when you change that, do the water pump because its right there too!!!

a 2003 buick regal dosen't have a timing belt it has a timing chain

it depend on the millage its a 3.0 liter engine with over 100,000km it was due to change check if water pump not jammed or bearing poulie jammed pierre