Ok
Timing belt costs $200 to replace. At 60K miles that is $0.00333/mile
At 100K intervals the cost per mile is half at $0.002/mile. So following the factory interval and you're costs over 100K miles is $333. You've save $133. Take away $50 when you need to get towed, and now you've only saved $83.
I made nearly 3x that an hour when I was teaching Java/Networking/etc, so when my time is considered, it is cheaper for me to have the work done as scheduled.
Plus, if you schedule the replacement, you can choose the shop at your leisure, you are guaranteed that it will be at a convienient time, etc.
So, if a broken belt causes me to miss 1/2 or classroom time, I've lost more money than I could have possibly saved.
That's not a gamble I'm willing to take.
I wanted every one of those billable hours
TB
