Multi-Weight Multi-Viscosity Motorcycle Oils Explained By Spectro

A multi-weight oil is an oil formulation that acts as if it has two different viscosities, depending on the temperature.

At the lower test temperature 40 C, it flows as the first number would indicate, and at the higher test temperature 100 C, it flows as the second number would indicate.

This multi-weight nature is made possible by the addition of long-chain polymers to the oil, which are coiled up when cold, but straighten out when hot, and thus change the flow characteristics of the oil.

Thus a 10w40 oil will flow like a 10 weight oil when at 40 C fairly thin, but will not thin out more than a 40 weight oil would when hot 100 C. Spectro Performance Oils.

Zipper's

4 Responses to “Multi-Weight Multi-Viscosity Motorcycle Oils Explained By Spectro”


  1. 1 Gil Berenguer Jun 8th, 2012 at 5:38 pm

    Which is the correct answer?

    Spectro Oils Answer From May 10th
    “As the oil temperature rises (normal operating temp 170-220 degrees F), the oil viscosity becomes lighter ”

    Today’s answer
    “At the lower test temperature 40 C, it flows as the first number would indicate, and at the higher test temperature 100 C, it flows as the second number would indicate.”

  2. 2 Darin Maltsberger - Instructor @ MTI Jun 10th, 2012 at 11:59 pm

    “Viscosity” is the measured resistance to flow at a spcified temperature. They are telling you the same information, just in a little different format. Spectro engineers some very unique, high quality products for almost any bike out there.
    -Darin

  3. 3 Gil Berenguer Jun 12th, 2012 at 6:03 pm

    The definition of “Viscosity is not the question.

    The first answer says that as the temp goes up the oil gets thinner. The second answer says that as the temp goes up it flows as the second number which would be thicker. If in your and their mind that means the same thing then they are just adding confusion to an already highly debated subject. (OIL)
    .

  4. 4 Ax Jun 21st, 2012 at 4:41 pm

    In any case, ALL multi-viscosity oils perform at the lower number in cold temps and the higher number at high temps.
    What they were trying to say in the older post was that oil flows more readily at higher temps, all other factors being equal.

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