Development and Field Testing of the Mack ESI Engine System

A program was conducted to develop an engine configuration and lubricant recommendation which would allow a 16,000 mile maintenance period. The program included an engine oil specification based on a multicylinder engine test, lube oil filters, coolant conditioner, cooling system modification, and increased sump capacity. Field tests were conducted. The Mack Extended Service Interval (ESI) system was developed as the result of this program.