Fuel requirements. New engines will require ultra-low sulfur diesel that has no more than 15 parts per million of sulfur. (This fuel has been used since 2006 in on-highway vehicles.) New engine technology. Changes likely to be most noticeable are in placement and packaging of aftertreatment systems and increased size of air intake systems. Most engines will be electronically controlled (a computer will monitor and adjust fuel and air mixture on a real-time basis), and on-road technology likely will be incorporated in the exhaust system (catalytic converters and/or particulate filters), in place of existing muffler and exhaust systems. EGR or […]