Looking to change the oil in my 2002 Johnson 4 stroke 9.9hp outboard. i have found threads about the lower unit oil, but I'm talking about the upper unit oil? Whatever chamber the dipstick hits, needs fresh oil and I'm at a complete loss of how to go about doing it. No manual with the motor and I'm really not the handiest person around. Anything is appreciated, especially fond of picture. Thanks in advance.