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Motor oil is a lubricant used on combustion engines to lube high velocity moving and rotating mechanical parts. The purpose of oil is to lubricate, reduce friction and help control engine temperatures. When changing engine oil make sure that the oil filter is changed to prevent any already contaminated oil from being recirculated back into the engine. Impurities such as metal shavings and foreign debris will get trapped into the oil filter.

Changing the engine oil is also a perfect time to inspect the oil. Using a black oil pan, drain the engine oil into the pan. Any metal shavings not trapped by the oil filter will settle at the bottom of the oil pan. Now, pour the motor oil in the oil pan into another pan and inspect the bottom of the pan for excessive debris or metal shavings. Metal shavings in the bottom of the pan will usually appear gold in color. Excessive amounts or large metal shavings can signify a problem. For proper engine oil and oil filter service procedures refer to your exact model year Repair Manual for your motor.


Exact oil maintenance procedures differ between Suzuki models and years. Refer to Service Manual for proper procedures.


NOTE: Inspect the oil level before every use.

1. Place the outboard motor upright on a level surface.
2. Check the oil level through the oil level inspection window if applicable on your year model motor. The oil should be seen in the whole of the window. If the level is low, add the recommended oil to the upper limit. See service manual for recommended 4 stroke motor oil, API classification and viscosity rating oils.

Perform the following steps in order to add the oil to the upper limit:

3. Remove the motor cover.
4. Remove the oil filler cap (dipstick) and wipe the dipstick clean.
5. Fill the engine oil to the upper limit.
6. Touch the filler cap threads onto the filler hole edge in order to check the oil level. Do not screw the filler cap.
7. Tighten the oil filler cap securely.


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

1. Place the outboard motor upright on a level surface.
2. Remove the oil filler cap.
3. Place a container under the engine oil drain plug.
4. Remove the engine oil drain plug and the gasket in order to drain the engine oil.
5. Install the gasket and the engine oil drain plug. Tighten the plug to the specified torque.

NOTE: See torque specifications when torquing the engine oil drain plug.

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

6. Pour the recommended engine oil to the upper limit.
7. Tighten the oil filler cap securely.

Engine oil amounts: See Service Manual

8. Start the engine. Allow the engine to run for several minutes at the idle speed. Check for oil leakage.
9. Turn off the engine and wait for approx. two minutes. Recheck the engine oil level.


NOTE: Refer to maintenance chart for interval inspection times for oil filter.

To inspect the engine oil filter :

1. Remove the power unit from the engine lower cover.
2. Detach the engine oil filter with the holder from the crankcase.
3. Inspect the engine oil filter for dirt, clog or other damage. Clean or replace the filter if necessary.


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.