The Cummins ISB5.9 G is a 5.9 litre six-cylinder natural gas engine that builds on the rugged, reliable design of Cummins diesel engines, and on the B Gas Plus, one of the most successful natural gas engines ever built.
The Cummins X15™ engine is off to an exceptional start since it went into full production last year, expanding the company’s industry leading market share for Class 8 heavy duty engines and winning praise for its durability and fuel economy.