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The following information are basic procedures for gear oil service. Since service procedures differ between year and models you must refer to your Repair Manual for the exact service guide lines and accurate information. This information is only provided to the user so they can judge the difficulty job and determine if they have the skills required to performer this operation.


NOTE: See maintenance chart for exact calender date or hours of operation to determine if your motor has reached the scheduled time for gear oil change.

1. Place the outboard motor upright on a level surface.
2. Place a container under the lower unit.
3. Remove the gear oil drain plug before the gear oil level plug and drain the gear oil.
4. Fill with the recommended gear oil through the oil drain hole until the oil just starts to flow out from the oil level hole.

Gear oil amounts : See service manual as exact amounts differ between year and model.
Recommended oil : Refer to specifications section in your service manual for type of gear oil.

5. Install the oil level plug before removing the oil filler tube from the drain hole.
6. Install the oil drain plug.

CAUTION: Do not re-use the gasket once removed. Always use a new gasket.

NOTE: To avoid insufficient injection of the gear oil, check the gear oil level 10 minutes after doing the procedure in the step 6. If the oil level is low, slowly inject the gear oil up to the correct level.


Refer to maintenance chart inspect intervals.
Apply the Water Resistant Grease to the specified points in your repair manual.
Special Material Required : See materials required for tpe of grease required.


Suzuki Models / Horsepower / Model Years

DF4 DF4 DF6 DF9.9 DF15 DF25 DF30 DF40 DF50 DF50 DF40QH DF50QH DF40T DF50T DF40Y DF50Y DF70 DF80 DF90 DF100 DF115 DF175 QH T Y 4HP 5HP 6HP 9.9HP 15HP 25HP 30HP 40HP 50HP 60HP 70HP 90HP 115HP 140HP 150HP 175HP 4 5 6 9.9 15 25 30 40 50 60 70 90 100 115 140 150 175 HP 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 99 00 01 02 03 04 05 06 07 08 09 10 11 Service Manual Repair Owner's Guide Diy Boat Engine Four Stroke 4-Stroke How To Fix.