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Thread: Lower unit lube question

  1. #1
    Member Alaska Gray's Avatar
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    Default Lower unit lube question

    When you all change the lower unit what color is it?
    Ive seen it light brown to milky.... Until yesterday, when one of my lower units it came out black.
    I talked to chad and he said then not uncommon and wasnt worried. he said my engine is older and as long its not milk then not an issue.
    he did say run in once to twice and then check it. if it black that quick maybe I do have an issue.
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    Gary Keller
    Anchorage, AK

  2. #2
    Moderator Daveinthebush's Avatar
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    Usually mine is pretty much the same color as the oil to begin with. Might be a little whiteish but never milky. I always check the magnet on the plug too for filings. Might be just a little especially if the girlfriend and been driving and shifting gears. The more white it is the more water is in the oil. Black?? Never heard of that happening.

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  3. #3
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    Black is definately odd for a lower unit IMO since there is no potential for carbon buildup? I wonder if someone put some oil in it with a graphite additive like SLP snow machine chaincase oil has?

  4. #4
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    Whats the engine got to do with outdrive oil? am i missing something? The oil in my drive always came out very dark brown almost black, i used a chevron synthetic that i bought in 5gal pails.

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  5. #5
    Member Roger's Avatar
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    What kind of lower unit are you talking about ? Is it an I/O or outboard ? If its a I/O milky means water in the oil. Bad seal somwhere Black is never good. I know this as My lower unit is getting resealed as we speak ,He said Black is very bad for my lower unit milky not good or that uncommon either but but can be fixed
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  6. #6
    Member Alaska Gray's Avatar
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    Twin out boards..... I think on the side of caution I will bring it in...
    Living the Alaskan Dream
    Gary Keller
    Anchorage, AK

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