IOM VoxPop | Engine Oil Glossary

Glossary of Engine Oil Terms

Some oil properties are more important to the life of your engine than others. The VoxPop® Engine Oil Report clearly and simply shows how an oil of your choice performed in lab tests of these nine critical properties. Click on the oil propery to learn more.

Engine Oil Properties

Acid Resistance

Fuel Efficiency Index

Gelation Index (Gelling Tendency)

Operating Viscosity

Oxidation Resistance

Pumping Viscosity (Pumpability)

Shear Stability

Starting Viscosity (Startability)

Viscosity

Volatility

Other Glossary Terms

SAE Viscosity Grade

Service Class/Category

Also see 'Helpful Links' for additional resources and articles about engine oil.