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LOUISVILLE, Ky. — Emphasizing the growing role of truck connectivity, Mack Trucks said it was extending its telematics hardware as an option for its model year 2011 and newer trucks equipped with Mack engines, effective May 1.

Mack Trucks' Granite model is the best-selling heavy-duty conventional straight truck in the United States, based on registrations of new commercial vehicles in 2016, according to the manufacturer.

Mack Trucks announced extended engine oil drain intervals for customers using its newly formulated genuine Mack engine oil EOS-4.5.

Choices for the largest diesel truck engines are thinning as Volvo Trucks North America and Mack Trucks are getting out of the 16-liter business.

In the cyclical heavy-duty truck market, what goes up must eventually come down, and that's exactly what happened to Mack Trucks in 2016.

Mack Trucks said it was developing an additional prototype of heavy-duty zero-emissions trucks for evaluation in Southern California, which has some of the worst air quality in the nation.

The parent company of Mack Trucks is planning to unload its governmental sales business area, which includes a North American defense division that is headquartered in Upper Macungie Township, Pennsylvania.

Mack Trucks said it has completed the rollout across its entire product line of its diagnostic and repair planning system, GuardDog Connect, adding it as a standard item most recently to its LR refuse models equipped with its standard MP engine.

Union workers at Mack Trucks have ratified a new, three-year labor agreement.