Most salesman don't want to discuss Exhaust Emission Maintenance but it's something that is very important for customers to understand. One of the Big Reasons is Future Cost of Ownership to YOU! Exhaust Emission Maintenance has drastically reduced the Particulate Matter and Exhaust Gases emitted into the air we breathe making a cleaner environment. Some Engines require add on features to clean the exhaust. The following information describes the Basics of Exhaust Emission Maintenance.