An oil with a viscosity index of 10W-30 has a viscosity of 10 when warm and a 30 when cold.

Name: An oil with a viscosity index of 10W-30 has a viscosity of 10 when warm and a 30 when cold.
Brand: Quizplus
Rating: 4.8 (31 reviews)

Question

Quizplus · Accepted Answer

The numbers in the oil's viscosity rating (10W-30) indicate that the oil has a viscosity of 10 in cold conditions (W stands for winter) and a viscosity of 30 at the engine's operating temperature, meaning it flows more easily when cold and thickens when warm to maintain optimal lubrication.

An Oil with a Viscosity Index of 10W-30 Has a Viscosity