Detroit Diesel MBE 4000 Spare Parts description of the catalogue:

The MBE 900 with electronic engine management system is offered in both four and six cylinder models, the 904 and 906. It is ideal for use in many different medium-duty truck applications including: food service, beverage, towing, recreational vehicle, refuse, general delivery, fire & emergency, utility, dump, transit bus, and school bus.

Big Power in a small package describes the MBE 4000 Class 8 truck engine. The MBE 4000 with electronic engine controls is an in-line six-cylinder engine. It weighs just 2,040 lbs, giving Detroit Diesel a heavy-duty engine that can be targeted to regional distribution, vocational, and bulk-haul applications.