10w40 but it should be approved for wet clutches.
its not really picky but I'd go for 5w40
regular 87 octane
you may add any 10w40 or 20w50 MOTORCYCLE OIL DESIGNED FOR THE WET CLUTCHES ON MOTORCYCLES.Do not use car oil.
rotella t6
the numbers on the oil determine the viscosity of it (thickness) so it means that after the engine warms up the oil will either be thinner or thicker for a certain amount of time, but to answer the question for the bike the best bet would be Castrol SAE 10W-40. that's what i use for my bike.(07 ninja 650). but if you find better let me know.
synthedic cascade
The recommended oil is SAE 10w 40. If the bike is use in under-10 degrees go to 5w 30 oil.
1.5l of 10w-40
synthetic oil about 500 ml per 20 liters , that what i use in my Honda cr-250 1997 , joe
10 W 40 general purpose motorcycle oil.
The recommended type of oil for a Honda XR 250 is Maxima Extra 15w50. This oil can be purchased at most auto parts stores or a cycle store.
gas engine? engine oil.... Diesel engine? rotella t 15-40W