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  1. #1

    RXP 300 Oil Analysis Results From Blackstone Labs *UPDATED*

    I had an oil analysis on the oil from my 2017 RXP 300. The oil had 25 hours of use. I changed it at 51 hours and my ski had 26 hours at the prior oil change. I had seen conflicting posts on oil change intervals which prompted me to run this test.

    My ski has the following mods: Riva Stage 2 tune, Riva Cold Air Intake, JP Racing Catch Can, Riva Free Flow Exhaust

    The TBN rating was 5.0, which the testing company remarked as very good. My understanding is this is the "life" left in the oil.


    Fuel dilution is high at 5.5%. Is this a cause for concern? Would the oil need changed frequently (Say at 25 hours instead of the recommended 50) to combat fuel dilution? Thanks!


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    Last edited by jserr68594; 11-09-2021 at 07:24 PM.


  2. #2
    SplishSplash's Avatar
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    What oil are you running? BRP, Amsoil, Shell?

  3. #3
    Team Bilford's Avatar
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    I have run a Blackstone report on my 18 PX since new. I will look at my results and compare.

  4. #4
    Quote Originally Posted by SplishSplash View Post
    What oil are you running? BRP, Amsoil, Shell?
    OEM Seadoo oil

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  6. #5
    Team Bilford's Avatar
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    I change my oil around 25 hours or so depending on how much I am riding in a season.
    That being said, consumables like the protection package metals are lower in your sample, but not enough to concern me about loss of protection.
    My fuel is around 1.8% on my samples, but again, you have more hours and another reason, you should consider changing more often.
    The big thing that caught my eye was the Moly. There should be no MOLY especially in a SC engine. That is a no no for the clutches. There is none in BRP 5W40 semi oil that I use and all of my testing show zero.
    What oil did you or previous owner use in this engine prior to the BRP oil?

  7. #6
    I bought the ski with 25 hours on it. I am not sure what the original owner used in it unfortunately.

  8. #7
    Team Bilford's Avatar
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    Quote Originally Posted by jserr68594 View Post
    I bought the ski with 25 hours on it. I am not sure what the original owner used in it unfortunately.
    You would expect a ski with 25 hours on it to most likely have the original fill in it. I'm pretty sure that it was changed at least once and with the wrong oil. It was most likely 30 wt automotive oil with an energy conserving additive package with moly.

    You should change the oil two or three times this season and get that moly level down quickly. Unfortunately, it attaches to metal and the film will take some time to wear down. In an ideal world, Blackstone would have known that moly should not be in a motorcycle with wet clutches or a SC PWC.

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  10. #8
    Here is the updated oil analysis after I ran the ski 24 hours.
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  11. #9
    Team Bilford's Avatar
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    Your additive package looks pretty normal for most oils other than the moly. That should be ZERO, maybe ONE at the most.
    It would be unusual for a MC oil with a JASO MA rating to have any moly in it.

    As far as the gas goes, it usually runs around 3.5% on a new engine at 15-20 hours. It will go down to the 2.5% range as the rings seat. The problem is the plasma coating on the 300s just allow a lot of blow by and that will contain gasoline. The lowest gas level that I personally have recorded is 1.8% on 23 hour oil with 70 hours on the engine.

    The report usually states the oil brand and type. You should always include that info on the type and grade section of the sample slip.

  12. #10
    Myself's Avatar
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    Fuel blowby is common on ANY boosted engine application. There will be more or less depending upon how much you're in full boost. I like for my boosted customers to just change oil every 20-25 hours, which is usually a full season for most of them.

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