Mazda has revealed that it's working on a new four-cylinder engine called Skyactiv-Z. The new engine is set to replace the Skyactiv-G versions in the United States, and it will launch in 2027.

The agency says in documents posted on its website Monday that connecting rod bearings on vehicles with 3.5-liter V6 engines can fail, leading to complete engine failure. Connecting rods link the ...