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  1. #1
    Petty Officer 1st Class dreamchaser's Avatar
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    Default mixed gas ok to use in 4 stroke

    A friend has some mixed gas 50/1 left over from the summer that he used for his kicker motor, which also has stabalizer in it....His main tank on the boat is empty ....Im wondering if He can pour this gas into the boat and run the motor... "honda 90hp 4 stroke"... to use it up and get the stabalizer thru as well ? thks for any input .......

  2. #2
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    Default Re: mixed gas ok to use in 4 stroke

    I wouldn't. Why take a chance on gumming up the Honda? If possible, I'd start the 90 at least once a month all winter.
    Lake Shasta with Mt. Shasta in the background, June 2011


  3. #3
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    Default Re: mixed gas ok to use in 4 stroke

    Save the 2 stroke gas for spring/summer top up the Honda with gas and stabil for the winter.

  4. #4
    Supreme Mariner kenmyfam's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    If you really want to use it then throw it in the car when you have at least half a tank. Acts just like an upper cylinder lubricant and will do no harm. I use mine up in the lawn mower occasionally or the weed whacker that is a 2 stroke and just gets better 2 stroke oil for a change !! make sure the mix is correct for it though.
    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  5. #5
    Vice Admiral Scaaty's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    I would not stick anything in a car with fuel injection but gas...

  6. #6
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    Default Re: mixed gas ok to use in 4 stroke

    Burning 2-stroke oil, which is designed to burn cleanly to begin with, won't be a problem if you mix it in at a highly diluted rate,like a 1/2 gal of 50:1 to 9 gal of pure gasoline. That would be a mix of 1000:1. It'll pass through anything just fine at that concentration and would be no different than using something like lucas fuel treatment, marvel mystery oil, or fuel injector cleaner at their recommended dosages which range around 100:1 to 500:1. But I would not just pour a 50:1 mix into an empty tank and run a 4-stroke at 50:1, nor let it sit for any length of time (at any mix rate) in the tank and especially in a carb because the chances are higher it'll separate or gum up and cause problems.

    forgot to mention, 2-stroke oil has some zinc and phosphorus in it. Even though it's a minute amount compared to engine oil, burning 2-stroke oil routinely at any rate will hinder and eventually kill a catalytic converter so you don't want to use it as a "regular" fuel additive on an auto.

  7. #7
    Petty Officer 1st Class dreamchaser's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    Ok.... thks All ......will pass on the these answers to my friend ......

  8. #8
    Supreme Mariner kenmyfam's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    Quote Originally Posted by ron7000
    Burning 2-stroke oil, which is designed to burn cleanly to begin with, won't be a problem if you mix it in at a highly diluted rate,like a 1/2 gal of 50:1 to 9 gal of pure gasoline. That would be a mix of 1000:1. It'll pass through anything just fine at that concentration and would be no different than using something like lucas fuel treatment, marvel mystery oil, or fuel injector cleaner at their recommended dosages which range around 100:1 to 500:1. But I would not just pour a 50:1 mix into an empty tank and run a 4-stroke at 50:1, nor let it sit for any length of time (at any mix rate) in the tank and especially in a carb because the chances are higher it'll separate or gum up and cause problems.

    forgot to mention, 2-stroke oil has some zinc and phosphorus in it. Even though it's a minute amount compared to engine oil, burning 2-stroke oil routinely at any rate will hinder and eventually kill a catalytic converter so you don't want to use it as a "regular" fuel additive on an auto.
    Thats more or less what I was trying to say!!

    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  9. #9
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    Default Re: mixed gas ok to use in 4 stroke

    I do it all the time, have a little 2 stroke mix left and thro it in the lawn mower, small air cooled 4 strokes could use the little lubrication it sets from the 2 stroke mix, granted I'm only putting in a quart of mix in a 3 gal tank on my rider mower

  10. #10
    Supreme Mariner kenmyfam's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    Quote Originally Posted by aerwin
    I do it all the time, have a little 2 stroke mix left and thro it in the lawn mower, small air cooled 4 strokes could use the little lubrication it sets from the 2 stroke mix, granted I'm only putting in a quart of mix in a 3 gal tank on my rider mower
    I agree. Never had any issues with a very light mix in a 4 stroke and my weed whacker is running great with the "premium" 2 stroke oil it gets occasionally !!

    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  11. #11
    Captain JUSTINTIME's Avatar
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    Default Re: mixed gas ok to use in 4 stroke

    its fine in carb motors but in fuel injection it may clogg the injectors
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