Heads up, I had a motor mount go bad. It is the #3 mount. Only sign was what looked like mud or oil splashed on top of the right fender inside the engine bay. Dealer replaced it no problem. Apparently it is a known problem with the Mazda3.
I was simply checking under the hood and noticed the oil stain. I'll take a picture and post it so others know what to look for.
Fluid is the worst thing that ever happened to motor mounts!
Can't think of a greater failure.
On the bright side, it provides indication that that motor mount has
gone bad.