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  1. #1

    Ultra 250 SC in 120 degree heat

    Next week I will be riding in 120 degree heat. The manual says I should be using 20-50w oil in this kind weather. Have any of you had 20-50w in your engines? How'd it run? thanks. jb


  2. #2
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    I dont run 20-50, but i rode the other day , it was 106* and humid, i was down @ 200-250 rpms, was running 7550 to 7600.

  3. #3
    Quote Originally Posted by Ultra250 Tn View Post
    I dont run 20-50, but i rode the other day , it was 106* and humid, i was down @ 200-250 rpms, was running 7550 to 7600.
    I spin about 7780 out here in the Pacific ocean (stock) where I live. Even in the summer the air is relatively cool and not much humidity. But yes that is a good point I will probably be down a few hundred rpm out there in the "heat of havasu". When I get back I will let you know what the engine spins in that kind of heat . . .

  4. #4
    SeaDoocer
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    We were in Havasu last month and it was 124 degrees one day..and the heat hit your face like a sand blaster...never had a problem with ski not running good.

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    tomgtv's Avatar
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    I run 15/50 W Mobil 1

    I run the heavier viscosity here in FL. I'd run
    it in any air temps over 80. The OEM is probably
    adequate but why not go to higher vis?

    Now that I've heard about this oil dilution I like a
    thicker oil in there.

    If you've ever looked at those temp/viscosity charts
    those 5 and 10w oils protect you to like -30 degrees
    Farenheit. If you're JetSkiing in those temps you
    are probably drinking so much liquor that it won't matter
    anyways!

  6. #6
    SeaDoocer
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    I couldn't agree more. This next oil change I will go with the 15-50 myself..it certainly won't hurt except cut down on speed by maybe 1% or 2% from what I've been told..not much of a sacrifice for better protection.

  7. #7
    tomgtv's Avatar
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    doubt speed loss

    I really doubt you'll see any speed loss. Remember
    it still pours good at 75 degrees. So when a motor
    heats up, it'll offer no resistance. In fact since it is
    a synthentic it for sure offers less resistance than dino
    oil.
    It also is a combination of viscosities, including 15W.
    Mobil makes this one for turbo and supercharged engines.
    They know the motor environment of a high performance
    motor most likely running in summer temps.

    BTW, Costco sells it by the case of 6 for $30. Hard to beat
    for a top of the line syn.

  8. #8
    SeaDoocer
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    Off I go to Costco tomorrow!

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