The Most Popular Diesel Engine For RVs. For years, no engine has combined proven reliability, power and towing capacity, fuel economy and high resale value better than the Cummins ISB6.7. Modifications to the turbocharging and control system have enabled lower emissions while delivering better fuel economy than that of prior models, lowering operating costs and leaving more dollars in your budget for trips you enjoy.

Proven Power. Every Call. ISB6.7 for EPA 2010. For superior performance at every rpm, Cummins ISB6.7 EPA 2010 is best-in-class. Its High Pressure Common Rail (HPCR) fuel system delivers an optimum balance of performance, emissions control and fuel economy across the entire operating range. The ISB6.7 incorporates a fully integrated aftertreatment system that combines cooled EGR with proven Selective Catalytic Reduction (SCR) technology. This proven technology delivers near zero emissions, while getting more power out of every drop of fuel.