MERCURY 4-STROKE OUTBOARD OIL TYPE AND CAPACITY INFO
SAE 10W-30 Mercury Four-Stroke Oil (included with new engine purchases) or a premium quality SAE 10W-30 engine oil, preferably marine grade when available.
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). Mercury recommends that engine oil be changed every 100 hours or once yearly, whichever occurs first. See your owner's manual for detailed information on how to fill and change engine oil.
| MODEL/HP | OIL CAPACITY |
| 2.5hp and 3.5hp | 10 fl oz. (300 mL) |
| 4hp, 5hp and 6hp | 15 fl oz. (450 mL) |
| 8hp and 9.9hp | 27 fl oz. (800 mL) |
| 15hp and 20hp | 1 qt. (1000 mL) |
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). Mercury recommends that engine oil be changed every 100 hours or once yearly, whichever occurs first. See your owner's manual for detailed information on how to fill and change engine oil.