One problem related to loud engine noise has been reported for the 2018 Mazda CX-5. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Mazda CX-5 based on all problems reported for the 2018 CX-5.
Engine makes loud noises after driving and acts like it's exhausted. This always happens when park the car and get out of it. There is a slight burning smell (which I was told would wear off after the first couple hundred miles), but it's still doing this. It's like the engine over heated (which no indicator) and it needs to cool off. The smell is the most concerning part.