Tohatsu/Nissan Four-Stroke Oil Type and Capacity InfoFour-stroke outboards use 10W-30 or 10W-40 four-stroke motor oil. We recommend a FC-W® rated NMMA (marine) certified four-stroke engine oil when available (10W-30 or 10W-40).
|2.5hp and 3.5hp||10 fl oz. (300 mL)|
|4hp, 5hp and 6hp||15 fl oz. (450 mL)|
|8hp and 9.8hp||27 fl oz. (800 mL)|
|15hp and 20hp||1 qt. (1000 mL)|
|25hp and 30hp||2 qt. (1800 mL)|
Use of synthetic oil is not recommended in 4-stroke outboard engines. Outboards use raw water cooling systems and using synthetic oil may prevent the engine from reaching sufficient operating temperature.
NOTE: With four-stroke outboards, oil is added directly to the engine crankcase. Four-stroke outboards use straight gasoline in the fuel tank (no oil mix). See your owner's manual for detailed information on how to fill and change engine oil.