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Thread: Unleaded or Premium

  1. #1
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    Unleaded or Premium

    I have used both unleaded and premium in all my 2 stroke outboards without doing any damage and I found that the premium fuel was better than the unl3aded.
    I now have my verry first 4 stroke outboard (115 Suzuki) and am wondering if I can still use 95/98 octane in this engine like I did on my previous 2 strokes.
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  2. #2
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    Quote Originally Posted by trout1105 View Post
    I have used both unleaded and premium in all my 2 stroke outboards without doing any damage and I found that the premium fuel was better than the unl3aded.
    I now have my verry first 4 stroke outboard (115 Suzuki) and am wondering if I can still use 95/98 octane in this engine like I did on my previous 2 strokes.
    Of course you can. What do you expect higher octane to do to the engine that may be detrimental?

  3. #3
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    Quote Originally Posted by bsperka View Post
    Of course you can. What do you expect higher octane to do to the engine that may be detrimental?
    I don't know, Thats why I asked.skied
    The engine has only done 340hrs and I don't want to bugger it up.
    I imagine that the higher octane fuel will make it run more efficiantly and maybe I could get more range out of a tank of fuel.
    I currently get 1.2 to 1.5 miles per litre (depending on conditions) and wouldn't mind getting better than that with the 95/98 fuel.
    I will run the tank super low and fill the boat up with premium ans see if there is any notable differance
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
    2007 79 Series Landcruiser V8 Ute, With a few Mods.
    4.6m Quintrex boat
    5.4m Trailcraft Sportscab Boat
    20' Jayco Expanda caravan

    2012 Navara twincab GONE

  4. #4
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    I can't see it doing any harm, but to satisfy yourself, check it out in the user manual.
    1973 SIII 88"
    1986 Isuzu 110 County
    '79 Bonnie/'06 Sprint

  5. #5
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    It only says use unleaded fuel only, The 95/98 is premium UNLEADED as far as I am aware.
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
    2007 79 Series Landcruiser V8 Ute, With a few Mods.
    4.6m Quintrex boat
    5.4m Trailcraft Sportscab Boat
    20' Jayco Expanda caravan

    2012 Navara twincab GONE

  6. #6
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    High Octane fuel does not give more economy unless the engine is tuned for 98 octane and there are knock sensors fitted.
    I doubt that is the case for an outboard.

    I suggest that you use the minimum octane specified by the manufacturer and maybe dose it with fuel preservative if you leave it a while with fuel in it.
    That is with the proviso that you do not use E10 as the alcohol can deteriorate in a shortish time and attract water .

    Most Japanese cars are designed to run on 91 and my Jazz loves it. The Jazz engine is an outboard engine. I would think that an outboard would be designed for the same. But if you like using 95 or 98 it will not harm anything.

    Regards Philip A

  7. #7
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    Every third tank full I add a "glurk" of metho to try and combat the moisture entering via the fuel vent, It seems to be working so far.
    When I first got the boat I drained the tank and it had about 5l of water in it so I am a bit weary about moisture build up.
    Here at King Ash Bay there is only a 8c differance between unleaded and premium so it wont cost much more to try it out.
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
    2007 79 Series Landcruiser V8 Ute, With a few Mods.
    4.6m Quintrex boat
    5.4m Trailcraft Sportscab Boat
    20' Jayco Expanda caravan

    2012 Navara twincab GONE

  8. #8
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    Quote Originally Posted by trout1105 View Post
    I have used both unleaded and premium in all my 2 stroke outboards without doing any damage and I found that the premium fuel was better than the unl3aded.
    I now have my verry first 4 stroke outboard (115 Suzuki) and am wondering if I can still use 95/98 octane in this engine like I did on my previous 2 strokes.
    The owners manual for my 70Hp Suzuki 4 Stroke, recommends 91 or 95 but suggests not to use 98 or Ethanol. No idea why not 98.
    I don't get any noticeable mileage difference between the two but then again don't do really do any long repeat hauls to compare.
    I think it runs slightly better on 95 than 91.
    MY12 Defender
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  9. #9
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    Quote Originally Posted by trout1105 View Post
    Every third tank full I add a "glurk" of metho
    You should really stop doing that as it's making your fuel into an ethanol fuel.
    Add an external water trap / filter if you don't already have one.

    Cheers Glen
    MY12 Defender
    Sold 99 D2 TD5
    When I grew up there were 9 planets.

  10. #10
    Join Date
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    I was trying to think of the name of the stuff I use in the mower fuel.

    It is "Stabil" and you can get it a Supercheap.
    Regards Philip A

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