17 Mazda 3 GT Engine Replacement
 

Bought a 2017 Mazda 3 GT with 8500 miles on it. Took it back 4 days later and after almost two weeks I’ve been told the Mazda Dealer is going to put a new engine in it as they heard a knock. The car is a manual and I suspect that the sales guys were dogging it.

What are your thoughts about the engine being replaced?
Is this a common occurrence with this engine?