For a Honda 300 Fourtrax, it's recommended to use a high-quality oil specifically designed for four-stroke engines. The most commonly recommended viscosity is 10W-40, though you should always check your owner's manual for the exact specifications. Honda's own GN4 or HP4 oils are good options, but other reputable brands that meet the necessary standards can also be used. Ensure the oil meets API service classifications for optimal performance.
four stroke motorcycle oil .
10w-30
Hypoid gear oil 80w90
10w30
10w-30
10w-30
10w-30
About 2.5 quarts
About 2.5 quarts of oil
i use 20w50 because its thick and lubes real nice
2 quarts
2.68 qt's