Perkins 1104D Operation And Maintenance Manual page 24

24 SEBU8172-04
Product Information Section
Engine Description
Engine efficiency, efficiency of emission controls, and
engine performance depend on adherence to proper
operation and maintenance recommendations.
Engine performance and efficiency also depend on
the use of recommended fuels, lubrication oils, and
coolants. Refer to this Operation and Maintenance
Manual, "Maintenance Interval Schedule" for more
information on maintenance items.