The various types of motor oil on the market are designed for different purposes. To choose the proper type of oil for your vehicle, you need to understand the significance of the oil additives, viscosity ratings, and classification codes.
Oil additives: To help the oil keep your engine cool, clean, and corrosion-free, refiners blend in various additives, which can account for as much as 25 percent of the cost of the oil.
Viscosity ratings: Oil is rated and identified by its viscosity, which determines its ability to flow.
To find out which viscosity to choose for your vehicle, look in your owner’s manual for an oil viscosity chart.
Oil classification codes: The starburst symbol on an oil container label means that the oil meets the current engine protection standard and fuel economy requirements of the International Lubricant Standardization and Approval Committee (ILSAC), a joint effort of U.S. and Japanese automobile manufacturers.