Discussion
A multigrade oil designated SAE 20W-40 behaves
Answer: D
Correct answer: like a 20 grade when cold and a 40 grade when hot
The W number is the cold rating and the second number the rating at operating temperature, so the oil is thin enough to circulate on a cold start yet still gives the film of a 40 grade when hot. A single grade oil cannot do both, which is what viscosity index improvers were developed to achieve.
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