castro conventional 10w30 with oem honda filter
(i use oem filter cuz it has a bypass valve so oil can pass through on startup when the motor needs it most)
try to use as thin oil as possible
cuz if you use thick oil then its gonna be like maple syrup so to speak so on start up when the oil is cold and thick it will take some time to get to the motor, and we all know that no oil =
motor