I have a johnson, 60 horsepower. halfway up the leg (the part that faces the boat which i believe is an exaust port) i have a small oil leak when i tilt the engine up. i have checked the oil in the crank by the lower part of the prop and it is full of oil so i have ruled out the seal. any other thoughts? would it be that my mix is calculated wrong or is it just excess oil that is not burning off. i am using 50:1 ???