Thomas Built Buses and Detroit Expand Warranty Coverage for DD5 and DD8 Engine Aftertreatment Systems

Contact: Fred Ligouri -  

HIGH POINT, N.C. – August 26, 2019 – Industry leader Thomas Built Buses Inc. along with Detroit Diesel Corp., a leading manufacturer of heavy and medium-duty diesel engines, have expanded the warranty options for the Detroit DD5 and DD8 engine aftertreatment systems. Currently, a standard warranty of five years/100,000 miles/160,000 km, including 100 percent parts and labor covers both the engine and the aftertreatment system of the DD5 and DD8 engines.  Now, customers have the option of adding on an extended warranty for just the aftertreatment system. 

“We continue to stand behind the quality and durability of our school buses and now our new Detroit engines,” said Caley Edgerly, president and CEO of Thomas Built Buses.  “The aftertreatment systems of our new Detroit DD5 and DD8 engines are one-of-a-kind with some of the greatest fuel efficiency in the marketplace and variable cam phasing, which in-the-end, cause less wear and tear on the aftertreatment system. This results in far less faults and a system that requires far less maintenance than conventional aftertreatment systems. We are pleased to offer our customers a state-of-the-art aftertreatment system and additional peace of mind through this extended coverage.”

Coverage options vary but can cover up to 10 years with unlimited miles/km. Detroit’s aftertreatment extended warranty will cover only the aftertreatment system.  Additional engine warranty coverage is also available to cover progressive damage to the engines.  For complete information about Thomas Built Buses or warranties, customers can consult their local dealer.


About Thomas Built Buses

Founded in 1916, Thomas Built Buses is a leading manufacturer of school buses in North America. Since the first Thomas Built bus rolled off the assembly line, the company has been committed to delivering the smartest and most innovative buses in North America. Learn more at or at

Thomas Built Buses, Inc., headquartered in High Point, N.C., is a subsidiary of Daimler Trucks North America LLC, the largest heavy-duty truck manufacturer in North America and a leading manufacturer of class 4-8 vehicles. Daimler Trucks North America produces and markets commercial vehicles under the Freightliner, Western Star and Thomas Built Buses nameplates. Daimler Trucks North America is a Daimler company.


About Detroit

Detroit is a single-source trucking business solution that offers mid-range and heavy-duty diesel engines, transmissions, axles, safety systems and connected vehicle services for on-highway and vocational commercial markets.  Detroit™ products are sold and serviced through a network of hundreds of locations located in North America.  For more information, or to find the nearest Detroit location, visit Detroit™ is a brand of Detroit Diesel Corporation, a subsidiary of Daimler Trucks North America.


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