Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 52Get this manual
OUTBOARD MOTOR INSTALLATION
2Remove cap and fill engine oil tank with oilReinstall the fill cap
aEngine Oil TankFill Cap
Priming the Oil Injection Pump
Before starting engine for the first time, prime the oil injection pumpPriming will remove any air that may be in the pump, oil supply hose, or internal passagesaOil Injection PumpOil Supply Hose