Diesel TEK Inc. offers a cost effective solution to increase mileage and lengthen the life of truck engines, even in the face of soaring fuel costs. Diesel TEK Engine Flush Service and Diesel TEK Fuel Additive are the two parts of the good maintenance program that the company is offering. Engine flush service removes the diesel particulate matter to improve engine efficiency and reduce wear and tear, while fuel additive causes the fuel to burn longer and cleaner, and adds lubrication.