[jbhuck]

I recently purchased an 18 hp evinrude 15926-04121 are the only numbers i can find wondered what year it was a what oil ratio to use with 2 cycle oil instead of 30 SAE oil any help would be appreciated

[Dunaruna]

1958.

I think the initial ratio recommendation was 16:1 but with TCW3 outboard oil you can raise that to 24:1. Do not use 4 stroke engine oil of any description, you will kill your motor.