I would imagine this issue has been addressed before but I didn't find it when I searched. I have a 2010 Aveo with 50,000 miles. The owner's manual says timing belt replacement at 100,000 miles. Reading the forums here, I see a lot of people saying replace at 50,000 and some saying 60,000. Why these recommendations contrary to what the manufacturer says? If I could save the $100 dollars, or whatever the belt costs, I would like to, but not at the expense of my engine. Any thoughts?