How much does a engine overhaul cost

The cost of and engine overhaul varies a lot depending on who does it and what needs to be done. You may want to find out what a replacement engine from Mazda costs, call the dealer parts department (better to have your mechanic call) and find out if they're still available & how much. Or check on a guaranteed used unit from an auto parts recycler (junkyard). Rebuilding an engine is usually expensive and replacement with a known good unit is often cheaper and a lot quicker. Here's a directory link for you: https://repairpal.com/mazda-repair-in-carrollton-texas