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Tech Tip; if you want to know how a multi-weight oil works, here is a breakdown for you.
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 40C, it flows as the first number would indicate, and at the higher test temperature 100C, 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 40C fairly thin, but will not thin out more than a 40 weight oil would when hot 100C.