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  1. #31

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    Quote Originally Posted by Team Bilford View Post
    Do you use one of Amsoil's motorcycle oils or their Marine 10W40?
    I feel a trick question here.

  2. #32

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    Yes, they do, marine and watercraft forum

  3. #33

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    A 40 weight not the best option as most people never warm these engines up properly. it's 30 seconds after start, then wide open. A 40W very thick and would need 5 mins of idle to thin to operating viscosity. As for the zinc, but really needed in this application, more for flat tappet engines. I run 5W40 rotella and no worries about the gas rating being gone.

  4. #34
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    Quote Originally Posted by Team Bilford View Post
    Do you use one of Amsoil's motorcycle oils or their Marine 10W40?


    No clutch washers, no S/Cer to worry about!

    However, used the Amsoil marine oil 10W/40 when supercharged.

  5. #35
    Quote Originally Posted by bluestram View Post
    A 40 weight not the best option as most people never warm these engines up properly. it's 30 seconds after start, then wide open. A 40W very thick and would need 5 mins of idle to thin to operating viscosity. As for the zinc, but really needed in this application, more for flat tappet engines. I run 5W40 rotella and no worries about the gas rating being gone.
    1st number, in the oil rating, is the cold temp viscosity. 40 applies to it's viscosity @ high temp. 200 degress iirc. So when you fire it up and the oil is ambient temp. the 1st number is what is important.

  6. #36

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    Quote Originally Posted by guybb3 View Post
    1st number, in the oil rating, is the cold temp viscosity. 40 applies to it's viscosity @ high temp. 200 degress iirc. So when you fire it up and the oil is ambient temp. the 1st number is what is important.
    First number is irrelevant for summer use as no winter start ups in this application. A 0W40, 5W40, 10W40 and straight 40W are all a 40 weight at operating temperature. A 5W40 will flow better at ambient temp, than a 40 weight as its thinner. Even a 0W40 is still thick at ambient temp, too thick to flow properly until it warms up, but better than a straight 40 for flow
    Last edited by bluestram; 08-17-2019 at 05:13 PM.

  7. #37
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    All of the oils for our application are 5W or 10W-40 oils. A multi weight 40 will always be thinner than a fixed 40 weight at any ambient. The difference is simply more noticeable at colder temps.

    I am actually more concerned about the 5 weight being too thin and breaking down too quickly. That's not a problem if you change the oil every 25 hours, but over 50, the viscosity enhancers added to get that 5W base stock up to 40W will not be in great shape. Also the BRP 5W-40 has an ambient temperature operating range of -31F to 104F. That's pretty low on the high end for much of the southern USA. I was shocked to see that on the jug.

    I run 15W-40 T6 Rotella in my motorcycles, but use the 5W-40 in my RXP because that's the weight that BRP recommends.

  8. #38
    I'd just thought it worth mentioning that Lucas Oil 10W-40 Hot rod and classics formula contains 2100 ppm Zinc, and also phosphorus, molybdenum. Lucas also states it contains many anti corrosion additives found in their marine formulas.

    https://lucasoil.com/products/hot-ro...w-40-motor-oil
    Last edited by truck240; 08-18-2019 at 10:26 PM.

  9. #39
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    Quote Originally Posted by truck240 View Post
    I'd just thought it worth mentioning that Lucas Oil 10W-40 Hot rod and classics formula contains 2100 ppm Zinc, and also phosphorus, molybdenum. Lucas also states it contains many anti corrosion additives found in their marine formulas.

    https://lucasoil.com/products/hot-ro...w-40-motor-oil

    You do not want any moly in the oil or any other "energy conserving" additives. Most JASO MA certified oils will have zero moly that could cause excessive clutch slippage.

  10. #40
    I don't have a supercharger to worry about. I've never used the Lucas oil but I might try it. I find these oil threads very informative. The problem with PWC is the low number of hours put on the engines in a year doesn't lend itself to routine used engine oil analysis. Most debate is simply speculation and conjecture.


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