Mercury 300XS OptiMax User Manual

FUEL AND OIL
42
IMPORTANT: Always make sure the oil tank caps are threaded
on tight. An air leak will prevent oil flow to the engine.
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Filling Engine Mounted Oil Reservoir Tank
Remove the top cowl. Loosen the fill cap on the engine oil reservoir
tank. Run the engine until all the air has been vented out of the oil
reservoir tank and tank is filled with oil to the point of overflow.
Re-tighten the fill cap. Stop the engine and replace the top cowl.
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NOTE: Filling this tank is only necessary if the oil level should ever
drop and the low oil warning system is activated.
Filling Fuel Tank
• Fill fuel tanks outdoors away from heat, sparks, and open
flames.
• Remove portable fuel tanks from boat to refill them.
• Always stop engine before refilling tanks.

Mercury 300XS OptiMax Specifications

General

Engine Type	2-Stroke
Horsepower	300 HP
Alternator Output	60 amp / 756 watt
Gear Ratio	1.75:1
Starting System	Electric
Fuel System	2-Stage Direct Fuel Injection (DFI)
Weight	505 lbs / 229 kg
Cylinders	6
Steering	Hydraulic
Shaft Length	25"