The hot-selling Hyundai Santa Fe sport utility vehicle got even more popular this summer with the addition of the 3.5-liter V6 engine. The Santa Fe 3.5-liter was introduced late in the 2003 model year. For 2004, the 3.5-liter engine is now standard on the LX model (where it replaces the 2.7-liter V6) and is available on the GLS model.