Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 72Get this manual
INSP ADJ
POWER UNIT
9Engine oil level
Between and Proper quantityAbove Check for over filling or for water in the engine oilBelow Add engine oil up to level and check for oil leakageNOTE: 9Run the engine for several minutes, turn it off, and check the engine oil level again9If the engine oils still not with in the proper level, adddrain as needed