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  1. #16
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    I took the optimax with me but never pored it in the oil tank, still have over a gallon. Took it back and got the premium plus. Thanks guys.

  2. #17
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    Quote Originally Posted by Teddy G View Post
    Anyone run Royal Purple Synthetic 2 Cycle oil in their Merc 300x or other 2 stroke motors?
    Great oil, it burns a little dirty, but the smell with race gas is heaven.

  3. Likes stoker2001 liked this post
  4. #18
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    Dec 2021
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    Hi all, 12 years on and same question…. What oil for the 300x, 2005 model, OT999451. AUSTRALIA.

    Merc Premium Plus is liquid gold. No-one in the country has it (incl Merc dealers), and if they do they will not freight it due to dangerous good rules.
    So I am looking for a tried and true alternative that is obtainable in Australia. Earlier in this thread Penzoil came up… nope, not Australian unfortunately.

    HELP!!!

  5. #19
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    I guess we have to ask what oils ARE available in Aus? Might be able to help with best available.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  6. #20
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    Many thanks, I’ll accumulate a list - any Aussies please feel free to add…. Everyone must be using something and not have 20ltrs of Merc Premium Plus stashed away lol

    Castrol - I have been using this on my 3ltr’s (225EFI) as premix. Acacdotally good, but that’s coming from unknown/ un qualified sources
    https://www.castrol.com/en_au/austra...ab_outboard-2t

    Royal Purple - I know nothing about
    https://www.royalpurple.com.au/store...or-oil-1-litre
    Last edited by Choppo21; 04-18-2022 at 06:14 PM.

  7. #21
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    Edit: just had a chat to Royal Purple tech. It’s being used in just about every mega high performance outboard in Australia, racing or not. Fine for premix or oil injection.

  8. #22
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    You can use that opti oil as a premix has I just use it 40:1 and it’s smokeless

  9. #23
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    I should conclude this thread. Ended up finding the Quicksilver Premium Plus oil which I will use. The Royal Purple is the cost of liquid gold lol.

    Now to decide on pre-mix or not. I read the factory metering is good for preventing plugs fouling at lower rpm? Being a 80% social ski boat with 20% outright speed days, thinking keeping the oil injection is a better option.

    But, always been sceptical on oil injection. At least with premix you know if it has fuel it has oil!

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