As far as this timing belt change thing. I hear that 50k is when, 60k is best and then I'm reading threads with people who have 100k plus and changing. My aveo5 just turned 50k and runs like a timex. Motor sounds great. I have no reason to believe at this point that it wont get up to 100k with any trouble. So should I change the belt beacuse people say to? Is there any warning signs at all that it needs to be changed or does it just simply give out and engine damage occurs?