1999 Volvo Penta "WT" Models Workshop Manual, Page 28Get this manual
Engine Break-In All engines have been run for short period of time as final test at the factoryYou must follow the Engine Break-In procedure during the first 20 hours of operation to ensure maximum performance and longest engine life
To ensure proper lubrication during the break-in period, do not remove factory break-in oil until after the 20-hour break-in is
completedFirst Two Hours
For the first five to ten minutes of operation, operate engine at fast idle (above 1500 RPM)After engine has reached operating temperature, momentarily reduce engine speed, then increase engine speed, to assist break-in of rings and bearingsDuring the remaining first two hours of operation, accelerate to bring boat onto plane quickly and bring throttle back to maintain planing attitudeDuring this period, vary the engine speed frequently by accelerating to approximately th ree-fourths th rottle for two to three minutes, then back to minimum planing speedMaintain planing attitude to avoid excessive engine load