The advanced Zetec-SE was developed in cahoots with Yamaha under the Sigma codename. They range in sizes from 1.25 L (1249 cc) to 1.7 L (1700 cc). Adding, it is extremely different from the Zeta engine. Abundantly available as used engines. This engine is sold under the Sigma name in some regions, while Mazda uses the MZI name. It is [...]