I think you meant to say the motor IS interference-type: Belt breaks, valves and pistons go "bang". Buy a new head.

The Mazda, on the other hand, is non-interference: Drive it 'til it breaks, coast to a stop, replace belt, re-time motor, get back on the road.

We'll be coming up on belt change intervals probably in about 6 months (we do 4k-5k hrs/yr). It'll be interesting to see the cost.

What was the nature of the warranty issue? Anything significant?