I went to get an oil change for my car which is a saturn view and they told me that after 100 000 you should get the timing belt and the water pump change. Is it true and if it is how much does it cost?

Well it would not be a bad idea but not completely necessary unless it is running awkward. If the timing belt wares it can slip out or rip and ruin the engine.100,000 is a fair amount of wear on one belt. The water pump is under the is behind the water pup housing. Due the difficulty, time and money involved with replacing one or the other it is usually best to do both at once as they are both right there. Your technician is telling the truth. Now your Saturn is not going to fall to pieces if you don't do this tomorrow but at 100,000 miles both are recommended. As for the cost, shops differ but it is a bit expensive. Not nearly as expensive as a new engine though. This is just a random guess $400 give or take. Let me know if this helps.

Hello.
Most vehicles manufacturers recommend changing the timing belt at around 120,000 miles.
The cost for changing the timing belt varies quite dramaticly. Dealerships often charge a labor rate of $130 to $150 per hour while local auto repair shops charge about $65 to $85 for the labor rate.
Timing belts, for trained mechanics, are a pretty easy fix.

Myself, I generally wait for a few warning signs that the water pump is going out, because, some may last for 100,000 miles, and some may last for 150,000 miles.
I hope hope this helps you!
Donnie

The timing belt should be replaced, the water pump is just to save having to do it at a later date. Both are good ideas at that mileage. Re: cost - you have to shop around, prices vary dramatically between parts & labor from different shops.