Maruti will phase out the current F10D engine of the Zen Estilo and will plant the 1.0 K-Series engine in it. The 1.0 K-Series engine is a 3 cylinder unit which does duty in the A-Star and is known for being fuel efficient. Along with the engine change, Maruti will also do minor cosmetic changes to the exterior as well as the interior to keep the car looking fresh. Remember due to Bharat IV norms Maruti has no option but to change the engines in almost all its cars.