Synthetic has greater resistance to oil thickening to maintain engine efficiency. The correct option is B.
An engine's efficiency is defined as the ratio of useful work done to heat provided is the completed work Please keep in mind that the term "work done" refers to the power delivered at the clutch or driveshaft.
This means that the work done by thermodynamic expansion is reduced by friction and other losses.
Lower viscosity without sacrificing wear protection and better cold-flow, both of which improve fuel economy, are possible with synthetic oil.
Thus, the correct option is B.
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