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Thread: what is best gear oil to use on old eaton drive?

  1. #16
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    oops Thanks Jamie, I meant 5W30

    post corrected (and now re corrected...it should read 20W50 SR-1 Racing Oil)
    Bob

    Covington, Washington
    1966 Donzi 16' Hull #16-226



    here are some short videos...

    a little video clip of our boat idling over to the boat launch so you can hear it.
    http://www.youtube.com/v/GSx8zAmi3R0

    Eaton outdrive rotating 101
    http://www.youtube.com/watch?v=auaFB...yer_detailpage

    thread on our boat
    http://www.donzi.net/forums/showthread.php?t=61975


    Video of the boat on the trailer

    http://www.youtube.com/watch?v=S9qXz4CJS8U

  2. #17
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    The only thing that I may be concerend with on that old Eaton drive is that it has old seals that may or may not be compatable with modern-day synthetics. But, that being said, I used to run Redline MT-90 which is GL-4 rated, rather than the recommended SAE 30 motor oil, in my Volvo 280s on my Magnum 27 with no problems.

    As for motor oil, I wouldn't get too hung up on which brand is best. Just make sure you use the correct wight. Something with a little heavier base like 15W-xx or 20W-xx is more like it in a older wide-clearenced mairne engine.

  3. #18
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    Quote Originally Posted by BobinCovington View Post
    oops Thanks Jamie, I meant 5W30

    post corrected
    Id prefer to see you probably use at least a 10-30 but depending on who rebuilt your engine they may have a specific reason or preference to a weight like that. If so I would use what they had recommended. Otherwise, usually 10-40, 15-40, 20-40 & 20-50 are a bit more common to use in most cases where an engine is a higher output unit or has been worked. The higher weight helps to hold up t thermal viscosity break down a little bit better and IMO the tiny bit of HP that you may gain for using a lighter weight oil is not worth it IMO.. Beyond that everyone sort of has their own preferences as to weight grade and brand favorites.. Jamie

  4. #19
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    Thanks for pointing my mistake out Jamie,
    At the risk of appearing like a total moron...I called Torco and asked again what weight he recommended and I was totally wrong. It was SR-1 Race Oil 20W50! I don't know why I wrote down the wrong weight (it must have been another conversation on my scratch pad), but thanks for catching that for me. I knew there was a reason I posted before I bought.
    Bob

    Covington, Washington
    1966 Donzi 16' Hull #16-226



    here are some short videos...

    a little video clip of our boat idling over to the boat launch so you can hear it.
    http://www.youtube.com/v/GSx8zAmi3R0

    Eaton outdrive rotating 101
    http://www.youtube.com/watch?v=auaFB...yer_detailpage

    thread on our boat
    http://www.donzi.net/forums/showthread.php?t=61975


    Video of the boat on the trailer

    http://www.youtube.com/watch?v=S9qXz4CJS8U

  5. #20
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  6. #21
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    old thread but I have a new question on the outdrive oil...

    How easy is it to change the drive oil on mine? From what I can tell, I loosen one of the cap screws at the bottom and drain the old oil out. Then replace the cap screw and fill to the "full" line on the drive fill plug.

    Am I close?
    Bob

    Covington, Washington
    1966 Donzi 16' Hull #16-226



    here are some short videos...

    a little video clip of our boat idling over to the boat launch so you can hear it.
    http://www.youtube.com/v/GSx8zAmi3R0

    Eaton outdrive rotating 101
    http://www.youtube.com/watch?v=auaFB...yer_detailpage

    thread on our boat
    http://www.donzi.net/forums/showthread.php?t=61975


    Video of the boat on the trailer

    http://www.youtube.com/watch?v=S9qXz4CJS8U

  7. #22
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    anyone know on this one...?
    Bob

    Covington, Washington
    1966 Donzi 16' Hull #16-226



    here are some short videos...

    a little video clip of our boat idling over to the boat launch so you can hear it.
    http://www.youtube.com/v/GSx8zAmi3R0

    Eaton outdrive rotating 101
    http://www.youtube.com/watch?v=auaFB...yer_detailpage

    thread on our boat
    http://www.donzi.net/forums/showthread.php?t=61975


    Video of the boat on the trailer

    http://www.youtube.com/watch?v=S9qXz4CJS8U

  8. #23
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    I don't think you're going to find much info on *that* drive bob...
    1982 18' 2+3
    SOLD - 1990 22' Classic, ATS Racing built 466 Ford, OMC King Cobra Hump back

  9. #24
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    It is like any other drive fill it from the bottom, keep dropping the top stick until it reads then slow down until full. Put the top plug in first then the bottom.

    Phil
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  10. #25
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    Thanks for the info but not sure what you mean by fill from the bottom unless you mean pumping it in...? I am looking at the Eaton drive owners manual and it is too vague about the procedure and only reads as follows...

    "to drain oil, place drive in normal operating position, remove propeller and remove lower oil drain screw (below prop). Removing fill plug for venting facilitates draining. Refill with oil specified above"

    It seems so simple but I don't want to drain the oil and then screw it up adding the new oil.
    Bob

    Covington, Washington
    1966 Donzi 16' Hull #16-226



    here are some short videos...

    a little video clip of our boat idling over to the boat launch so you can hear it.
    http://www.youtube.com/v/GSx8zAmi3R0

    Eaton outdrive rotating 101
    http://www.youtube.com/watch?v=auaFB...yer_detailpage

    thread on our boat
    http://www.donzi.net/forums/showthread.php?t=61975


    Video of the boat on the trailer

    http://www.youtube.com/watch?v=S9qXz4CJS8U

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