I live in Wisconsin and have a 2006 MDX with 100k miles. Firestone guys advised me to change the timing belt. should I do it right now or wait until 105k the manual advised?

 

I don't see any harm in changing it now.

5K miles is about the time we usually change out oil in about 3 months of driving. YMMV (your mileage may vary). So for me that decision would be do it now or within the next 3 months. Why not now?