Car blog Page 364

Practical automotive articles on maintenance, diagnostics, vehicle systems, buying used cars, tires and electric driving.

What Is SAE 90 Gear Oil? Systems

What Is SAE 90 Gear Oil?

SAE 90 gear oil is a single-grade gear lubricant viscosity rating. Learn what the number means, where it is used, how it differs from 80W-90 and engine oil, and how to choose correctly.

Systems

What Is API GL-5 Gear Oil?

API GL-5 gear oil explained: what the rating means, why it suits hypoid axles and differentials, how it differs from GL-4, and when it may be the wrong choice.