Volvo D11F Operator's Manual And Maintenance Instructions page 24

20 General Information
Engine Control, EGR and Fuel Systems
Acts that constitute tampering with Engine Control, EGR and Fuel Systems:
Removing rendering inoperative, or modifying the engine control system such
as the ECU, EGR system components, or fuel system components, in order to
allow the engine to operate outside of the manufacturer's specifications is not
allowed and violates both warranty and legislation.
Noise Control Log
NOISE CONTROL SYSTEM MAINTENANCE LOG
MAINTENANCE MAINTENANCE
DATE MILEAGE
PERFORMED FACILITY