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Which advantage does a synthetic gear oil offer?

  • A.A wider temperature range and a thicker film
  • B.A lower cost, which is why synthetic oils have displaced mineral oils in the majority of automotive applications
  • C.Greater compressibility
  • D.A higher pour point, which prevents the oil from draining away from the gear teeth when the vehicle is standing

Answer: A

Synthetic base stocks flow at lower temperatures and retain viscosity at high ones, and their pressure viscosity behaviour gives thicker films. Cost is higher rather than lower. A low pour point is desirable, so the last option inverts the requirement. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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