After the used oil has been drained, the old oil filter removed, and the new filter installed, add the new oil. Your owner's manual provides recommendations on the viscosity grade, performance level, and amount of oil required for your vehicle. Most automobile manufacturers recommend that you use an oil meeting the latest International Lubricant Standardization and Approval Committee (ILSAC) specification. Oils certified by API as meeting this specification may display the API Certification Mark "Starburst" (API's Engine Oil Program) and API Service Symbol "Donut." Diesel engine manufacturers typically recommend oils meeting a specific API diesel oil service category. Oils certified by API as meeting one or more of these categories may display the API Donut.

The owner's manual will also help you find the oil fill cap. Remove the oil cap and add the amount of oil required by the instructions in the owner's manual. Do not overfill. Use a funnel to prevent drips and make sure to empty completely each container of oil.