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Oil Type: What type of oil should I use in my 4-stroke outboard?

Four-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.

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