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Thread: oil additives in 4 strokes

  1. #1

    Default oil additives in 4 strokes

    there's a boat I'm working on at the shop that has older Honda 90's on it. Not a lot of hours on them (575) but the owner is asking about an oil additive that he can use. One of the motors' oil is more black in color than the other and reportedly uses a bit more oil overall between changes but otherwise runs exactly the same as the other.
    Curious if an automotive oil additive like Lucas or something would be good to run?
    Thanks!
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  2. #2
    Member Bullelkklr's Avatar
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    I would not run anything in it other than recommended oil that meets specs that are published by the engine manufacture.

    Are the cylinder pressures the same as the other engine? I'd pull a pressure test and verify.

  3. #3
    Member Akgramps's Avatar
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    Use a good Synthetic oil....
    “Nothing worth doing is easy”
    TR

  4. #4
    Member DRIFTER_016's Avatar
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    Quote Originally Posted by Akgramps View Post
    Use a good Synthetic oil....

    ^^^^ Yup!!!
    Mobile 1 goes in all my engines!!

  5. #5
    Premium Member kasilofchrisn's Avatar
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    I like to add some Seafoam in mine.
    You can add it to oil or gas.
    My sister once had a car that had the motor knocking. By the time my dad had half the can poured in the knocking had stopped.
    I wouldn't hesitate to try it.

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  6. #6

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    Sea foam into the crankcase directly? Will pass along the info and recommend synthetic oil next oil change. Thanks!
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  7. #7
    Moderator bkmail's Avatar
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    We run Amsoil in everything, lower units too.

    Another vote for Seafoam, never added it to the crankcase though. It does clean up issues in the fuel system and it works immediately.
    BK

  8. #8
    Premium Member kasilofchrisn's Avatar
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    [QUOTE=Big Jim;1393966]Sea foam into the crankcase directly? QUOTE]
    Yes directly into the crankcase. Many people do it right before an oil change to clean things up a bit.
    I usually just add it to my gasoline but it is also recommended by the manufacturer for adding to the oil as well.
    "The closer I get to nature the farther I am from idiots"

    "Fishing and Hunting are only an addiction if you're trying to quit"

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