Welcome Guest - Sign Up today
Welcome Guest - Sign Up today



Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
See more
See less

Recommended gear oil weight for 1964 Kiekhaefer 1000 Mercury Six lower end?

  • Filter
  • Time
  • Show
Clear All
new posts

  • Recommended gear oil weight for 1964 Kiekhaefer 1000 Mercury Six lower end?

    I have a 1964 Kiekhaefer 1000 Mercury Six, 100 HP outboard motor that I am servicing (without a manual) and I have been unable to find information on recommended gear lube for the lower end. Does anyone have information on this subject? Thanks.

  • #2
    Regular lower unit oil, 90 wt. Hypoid. If brand matters, use whatever your Mercury dealer carries. Keep in mind, Mercury was late to the stainless steel game and the shafts from that era are noted for pitting around the seal areas. Keep an eye on your oil color, noting whether it gets milky which indicates water intrusion.
    Share A Project Page for 1971 GW Invader Banchie 13
    Share A Project Page for 1976 American 18
    Share A Project Page for 1974 American 15


    • #3
      Sign up today
      It would be recommended to use a synthetic blend 90 weight gear lube, but you do want to use what you have used in the past to prevent different weights from mixing. A good way to tell what was used previously is, by the color of the ear lube if it is a synthetic blend it should be green or blue ( a neon color) if it is premium 80 weight it would be more of an amber color.