MerCruiser 350 MAG Owner's Manual page 76

Section 5 - Maintenance
5. All Other Models: Place the sterndrive unit in full trim limit out position, remove the oil
fill/drain screw and sealing washer and drain the oil.
6. Remove the oil vent screw and sealing washer. Allow the oil to drain completely.
IMPORTANT: If any water drained from the oil fill/drain hole, or if the oil appears milky, the
sterndrive unit is leaking and should be checked immediately by your authorized Mercury
MerCruiser dealer.
7. Lower the sterndrive unit so that the propeller shaft is level. Fill the sterndrive unit,
through the oil fill/drain hole, with specified gear lubricant until an air‑free stream of
lubricant flows from oil vent hole.
Tube Ref No.
IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in
sterndrive unit.
8. Install the oil vent screw and sealing washer.
9. Continue to pump gear lubricant into the gear lube monitor circuit until the gear lubricant
appears in the gear lube monitor.
10. Fill the monitor so that the oil level is in the operating range. Do not overfill. Ensure that
the rubber gasket is inside the cap and install. Do not overtighten.
NOTE: Oil capacity includes gear lube monitor.
Page 68
b
a
a - Oil fill/drain screw
b
a
a - Oil vent screw
Description
High Performance Gear
87
Lubricant
mc79507-1
b - Sealing washer
mc77106-1
b - Sealing washer
Where Used
Sterndrive unit
90-864195072 OCTOBER 2007
Part No.
92-858064K01