How much oil do you put in a 90hp outboard Yamaha motor?

For a 90hp Yamaha outboard motor, the oil capacity typically ranges from about 3 to 4 quarts, depending on the specific model and year. It's essential to consult the owner's manual for the exact specifications, as well as recommendations for the type of oil to use. Always check the oil level after filling to ensure proper lubrication and performance.