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  1. #1
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    Quick ?, correct oil for 300x

    I have new to me 2003 300x. Is the Mercury Optimax/DFI synthetic blend the correct oil?

  2. #2
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    Charlotte, NC
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    I run the Penzoil Full Synthetic in my 300X Mercs w/ no problems.

  3. #3
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    Wil what I have be ok? I'm trying to leave for the river right now. THanks

  4. #4
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    I don't think that will hurt it but that oil was really designed for the DFI engines. I'd run pennz 100% or merc racing or similar going forward.

  5. #5
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    I run Mercury Premium Plus in my 2004 300X.
    Ed
    1986 Wellcraft Scarab 1 SS, LS3 Alpha One
    1997 28' Nordic Heat, 509 BBC Mag MPI Bravo 1
    1990 21' Superboat, 2004 300X Promax, Sold
    1989 19' Cougar MTR V-Drive, 466" BBF. Sold
    1973 Formula F18, 350 MPI Alpha. Sold
    1965 Wellcraft R1700, Merc 1000. Sold

  6. #6
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    Long Island
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    deffinetly premium plus in 300x the dfi oil is not for higher horsepower even the dfi 225 250 etc recommend premium plus

  7. #7
    Join Date
    Jul 2004
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    fenton, michigan
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    premium plus

  8. #8
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    full synthetic pennzoil

  9. #9
    Join Date
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    shreveport,la
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    Is it a steel sleve block..?
    Kevin Kiser

  10. #10
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    anything but the dfi oil.

  11. #11
    Join Date
    Oct 2004
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    Cape Coral fl
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    AMSOIL HP Injector Oil

  12. #12
    Join Date
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    Sebastion Fl
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    Dfi oil

    No way i would run that chit in my motor even mercury doesn;t recomend it in the motors lots of my fishing buddys used to run it in there opti;s and where blowing powerheads left and right went to premium plus no more problems the dfi oil is thin as water and doesn;t have very good adhesion to motor parts go with pre plus or a synthetic blend oil or even a full synthetic now that it is broke in well.amsoil is my recommendation or klotze is good as well. Dave

  13. #13
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    port st. lucie, fl
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    being a steel bore you should run the pennzoil synthetic blend, and definetely not the dfi oil
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  14. #14
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    Premium Plus Yes. Good Fuel !!) Or alot of extra cash for parts.
    JJ

  15. Likes stoker2001 liked this post
  16. #15
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    Bradenton, FL
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    Royal Purple 2 Cycle Synthetic

    Anyone run Royal Purple Synthetic 2 Cycle oil in their Merc 300x or other 2 stroke motors?

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