With the best power-to-weight ratio in its class, the MBE 4000 has become the preferred engine for vocational, regional distribution and bulk-hauling operations throughout North America. Weighing just 2,270 lbs., this six-cylinder powerhouse is available in ratings from 370 to 450 horsepower and 1,250 to 1,650 lb-ft of torque. The 2007 MBE 4000 will build on this tradition of performance and flexibility, offering even greater power and durability than before. This is the engine for anyone seeking excellent fuel economy and low cost of operation - all in a lightweight heavy-duty package

Tightening Emission Standards

The EPA has been reducing diesel emissions for the past 30 years. The 2007 regulations demand changes in both fuel and engine technology. The new regulations dramatically reduce nitrogen oxide (NOx) by 55 percent and particulate matter (soot and ash) by 90 percent. We achieved the first target by optimizing the existing Exhaust Gas Recirculation (EGR) system and the second by adding an Aftertreatment System, comprised of a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF).

Exhaust Gas Recirculation (EGR)

Exhaust gas recirculation systems have been optimized to dramatically cut NOx formation by routing a measured amount of exhaust flow to the cylinders to lower combustion temperatures. Lower temperatures result in lower NOx levels without the negative effects of retarding engine timing.

SMART Fuel System®

The new SMART Fuel System adds to the performance and cleanliness of the 2007 MBE 4000. It features electronically controlled injection nozzles capable of multiple injections per combustion cycle.

Maintenance-Free Electrostatic Breather

The electrostatic breather system removes oil from crankcase vapor before it's vented into the atmosphere. The system sends oil droplets back to the sump where they can continue to serve the engine, reducing oil consumption. And the best thing is, it requires no maintenance.

Detroit Diesel Electronic Control (DDEC) VI

Detroit Diesel set the benchmark for heavy-duty diesel engine electronics. Now, they've raising the bar with the sixth generation DDEC VI electronic engine management system. It employs a more powerful microprocessor, increased memory and enhanced diagnostics. The DDEC VI is capable of monitoring and managing all engine functions, including the Aftertreatment Systems required for 2007 emissions. DDEC VI is a key part of the strategy to achieve greater operating efficiency and cleaner exhaust emissions.

Engine Brakes

The best engine-brake technology just got better. The MBE 4000 comes with a standard exhaust brake - at no extra cost or weight - that provides 370 braking hp. For buyers who need more, we offer an optional Premium Engine Brake that boosts braking power to a whopping 580 hp. The 2007 MBE 4000 offers increased flexibility in making the proper engine brake selection. Trucks can be ordered with the standard engine brake and uprated to the Premium Engine Brake at authorized service centers.* Both the Standard and Premium Engine brakes are known for their quiet operation, increasing service brake life, improving driver safety and increasing resale value.

*Uprate charges apply

Support Network

Your MBE 4000 engine can be serviced by Western Star dealers across North America, as well as by Sterling Truck dealers, Freightliner dealers, and Detroit Diesel Distributor locations -- all with factory-certified technicians who know your MBE 4000 inside and out. NAFTA-wide parts are available at all Western Star dealers, as well as Sterling Truck dealers, Freightliner dealers, and Detroit Diesel Distributor locations.

Immediate roadside assistance and technical support are just a telephone call away, 24/7.
Just call 1-866-850-STAR.