Can I Use 4 Stroke Oil To Burn In A 2 Stroke Sea Doo ?

Discussion in 'Outboards' started by Sceptre, Mar 29, 2010.

  1. Sceptre
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    Sceptre Junior Member

    I have a 85 hp outboard johnson but my friends have sea doos 2 stoke bombardier and were thinkin of using the same gas canister to fill up now i have 4 stroke they have 2 stoke is it okay for us to share the same gas that has 4 stroke oil mixed ?
     
  2. alan white
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    alan white Senior Member

    Only in an emergency. The oil will quickly carbon up the cylinders and valves.
     
  3. Zappi
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    Zappi Senior Member

    If youre stuck with 4 stroke oil for a two stroke... 30 weight non detergent is the best. Of course thats not the same youre running in your Johnson most likely. I've been running Delo 100? (meant for two stroke diesel). It's cheaper, I already have it and no issues in over a year with a consistent 5+ hours use per week. Plugs always look good and clean. Again doesnt pertain to you so much.
     
  4. marshmat
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    marshmat Senior Member

    If I'm reading Sceptre's question correctly, the situation is:
    - One 4-stroke outboard
    - One 2-stroke PWC
    - Can they burn the same gas?

    The simple answer is to just keep plain, unmixed gas in your jerry cans (and label them as such!). If the two-stroke is oil injected, it'll work fine with plain gas in the tank; if it's a pre-mix type, you can mix the oil just before filling it (you should keep a few bottles of oil in the PWC's cargo bay if this is the case).

    If you're asking about whether it's OK to use 4-stroke oil in a 2-stroke, then Alan and Zappi's replys are applicable. I've done this once (by accident, thanks to a mis-labelled container); the engine (carb-induction Johnson 30) ran just fine at speed, albeit with a stubborn idle, and needed a decarbonizing treatment afterwards (although it wasn't harmed).

    If you're thinking of using mixed gas in a 4-stroke- well, I've heard of it being done on old Chevy pickups, but this falls into the Not A Good Idea category. You should not be mixing any oil into the fuel for a 4-stroke.

    And, Sceptre- it would be helpful if you were to write in proper sentences with normal punctuation.
     
  5. alan white
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    alan white Senior Member

    No, i said you could use mixed fuel in an emergency in a 4 stroke. The small amount of oil will cause problems if used more than very occasionally.
     
  6. marshmat
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    marshmat Senior Member

    Sorry Alan, I misinterpreted your earlier post. And I concur with your assessment regarding mixed gas in a 4-stroke: it'll run in an emergency, but not good for the engine.

    Short answer: Always feed an engine what its owner's manual tells you to feed it :)
     
  7. powerabout
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    powerabout Senior Member

    With pre cat-con cars I have run hundreds of gallons of old 2 stroke fuel in my cars and could never tell the difference?
    as for
    "Can I Use 4 Stroke Oil To Burn In A 2 Stroke Sea Doo ?"
    as Bombardier mandates the highest spec 2 stroke oil made, API-TC ( which very few companies produce) I would think you are taking a huge risk
     
  8. CDK
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    CDK retired engineer

    Of course you can't do wrong following that principle Matt, but you may waste some money.
    For commercial reasons only oil companies are lobbying to get their most expensive and exclusive product specs in an engine manual. A the same time the competition quickly adds that new spec to their existing product as being equal or better.

    Several years ago a retired head of research from Shell stated on television that modern synthetic lubricants retain their properties indefinitely, so oil changes are totally unnecessary as long as the filter is changed (or washed) at regular intervals. That started some commotion, but the man was not available for further comment.
    There never was a law suit because that would probably reveal facts the oil company preferred to hide. I guess they had him sign a document and paid him handsomely.
     
  9. Frosty

    Frosty Previous Member

    Ols is not oils, not in this case. you are seriously risking engine damage and Im not talking about carbon build up.

    2 stroke oil is diluted 100 to one thats not much oil that the entire engine needs to lubricate, use the proper stuff.

    But why are you running your Johnson on 4 stroke oil mix?

    Thats bad too.
     
  10. pistnbroke
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    pistnbroke I try

    Well if you go to my local national equipment hire shop they put 2 stroke fuel 50:1 mix in everything so that they dont get a 2 stroke being filled with plain petrol ....and the hour meters have thousands on hours on them .....

    that is if I read this right they want to use the two stroke TC3 mix for the seadoos in the 4 stroke Jonno..


    I think there is a typo in the queston ...he means 2 stroke oil not 4 stroke oil ...???
     
  11. Frosty

    Frosty Previous Member

    Yeah you need to re ask the question.
     
  12. FAST FRED
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    FAST FRED Senior Member

    2 stroke oil comes in 2 blends.

    One is for air cooled (chainsaw , weed wacker) ,, the other is for water cooled 2 strokes , outboards.

    DO NOT get them confused or use the "wrong" oil for the service, their makeup is very different.

    FF
     
  13. CDK
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    CDK retired engineer

    Please explain the 2nd part of that last sentence in detail Fred. "Very different" is not a qualification you would have used comparing iron and copper or gasoline and diesel.
     
  14. pistnbroke
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    pistnbroke I try

    as stated the question is mixed up (ha joke 2 stroke mixed up ...) .....there is strictly no such thing as 4 stroke oil only sump oil ......however it seems the outboard makers to avoid confusion are selling the sump oil for there 4 strokes labeled 4 stroke oil .....why ? they claim its got special properties to reduce emmissions.

    Still think this guy wants to use him mates 50 to 1 TWC3 in his 4 stroke johnson which is a re badged Suzuki outboard


    Waste of time continuing with this until the writer clarifies and I am supprised you all did not spot the error on first reading no 1 post
     

  15. Sceptre
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    Sceptre Junior Member

    basicaly i have a outboard boat and my 2 friends have bombardier seadoos so my outboard and the seadoos both need mixed gas so how can we share same can I didnt understand
     
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