Gearcase Lubrication - Mercury Optimax User Manual

2. Remove fill cap and check fluid level. The fluid level should be
even with the bottom of the fill hole. Add Quicksilver or
Mercury Precision Lubricants Power Trim & Steering Fluid. If
not available, use automotive (ATF) automatic transmission
fluid.

Gearcase Lubrication

When adding or changing gearcase lubricant, visually check for
the presence of water in the lubricant. If water is present, it may
have settled to the bottom and will drain out prior to the lubricant,
or it may be mixed with the lubricant, giving it a milky colored
appearance. If water is noticed, have the gearcase checked by
your dealer. Water in the lubricant may result in premature bearing
failure or, in freezing temperatures, will turn to ice and damage the
gearcase.
Examine the drained gearcase lubricant for metal particles. A small
amount of metal particles indicates normal gear wear. An
excessive amount of metal filings or larger particles (chips) may
indicate abnormal gear wear and should be checked by an
authorized dealer.
DRAINING GEARCASE
1. Place outboard in a vertical operating position.
2. Place a drain pan below outboard.
MAINTENANCE
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