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Thread: Did you know...........

  
  1. #1
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    lee gsi's Avatar
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    Did you know...........

    Just been to college today and learned that you should change oil when its cold as that's when its at its most viscous (Runny) and that spraying a rad or intercooler makes it less efficient.
    The truth is always the truth even if you haven't realised it yet...

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    jimdt's Avatar
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    no and yes, but how is oil more viscous when cold?

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    Eh,highly viscous means that it is thick,less viscous means that it is runny. And oil will always be less viscous when it is warm. It flows easier.
    REDBULL F1

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    Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or extensional stress. In everyday terms (and for fluids only), viscosity is "thickness." Thus, water is "thin," having a lower viscosity, while honey is "thick," having a higher viscosity. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. For example, high-viscosity magma will create a tall, steep stratovolcano, because it cannot flow far before it cools, while low-viscosity lava will create a wide, shallow-sloped shield volcano. Put simply, the less viscous something is, the greater its ease of movement (fluidity). [1] All real fluids (except superfluids) have some resistance to stress, but a fluid which has no resistance to shear stress is known as an ideal fluid or inviscid fluid. The study of viscosity is known as rheology.
    REDBULL F1

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    GB's Avatar
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    checks calendar....no its not April 1st

  6. #6
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    lee gsi's Avatar
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    Oil is say 5w40

    That means it has lower viscosity at W which standard for Winter or cold

    You don't want runny oil when the car is hot as it wont have the same lubrication property's
    The truth is always the truth even if you haven't realised it yet...

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    Tom Clark's Avatar
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    Dont the new evo's and scoobys have cold water sprays for the intercoolers?

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    lee gsi's Avatar
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    Quote Originally Posted by Tom Clark View Post
    Dont the new evo's and scoobys have cold water sprays for the intercoolers?
    Yes they do


    PS: When I said spraying I ment with paint
    The truth is always the truth even if you haven't realised it yet...

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    Quote Originally Posted by lee gsi View Post
    PS: When I said spraying I ment with paint

    Oh, my bad.

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    what would you spray paint your rad?

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