Mercury 4C Instruction Manual page 83

3. Remove vent plug and fill/drain plug and drain lubricant.
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 195 cc (6.6 fl. oz.).
GEARCASE LUBRICANT RECOMMENDATION
Mercury or Quicksilver Premium or High Performance Gear
Lubricant.
CHANGING GEAR OIL
1. Place outboard in a vertical operating position.
2. Remove the oil drain plugs (upper and lower), and
completely drain the gear oil into a pan.
NOTE: If water in the oil, giving it a milky colored appearance,
contact your dealer.
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MAINTENANCE
a -
a
b -
b
27146
a
a -
b -
b
41070
75
Vent plug
Fill/drain plug
Oil drain plug (upper)
Oil drain plug (lower)