Re: Sea King 3.5 hp Owners Manual or Parts List 1967 Home › Forum › Ask A Member › Sea King 3.5 hp Owners Manual or Parts List 1967 › Re: Sea King 3.5 hp Owners Manual or Parts List 1967 cajuncook1Replies: 842Topics: 72 October 31, 2018 at 6:02 am #85231 I was incorrect with my information. Lower units used a marine type 90wt gear oil.