How to Mix SAE 10W-30 With 5W-30

    With the advent over the past several decades of quick-oil-change shops, most automobile owners no longer change their own oil. But they often find the need to add oil between changes to maintain oil levels and ensure engine performance. Car owners may not remember what grade of oil is in their cars, or they might have a different brand or grade on hand than what's currently in their engines. They worry about mixing 5W-30, for example, with 10W-30 and how to do it. This is a simple and safe process.

  1. Determine the type of oil currently in your car. Check your service records or read the label on the can of oil sitting on the shelf in your garage.

  2. Open the hood of your car and remove the oil dipstick. Take note of the fluid level and determine how much oil you need to add (the dipstick usually will indicate the proper amount to add, such as "ADD 1 QUART" or "FILL TO HERE").

  3. Wipe the dipstick clean with a rag and replace into the receptacle.

  4. Remove the oil filler cap and place a funnel in the opening.

  5. Pour the proper amount of oil into the oil fill reservoir.

  6. Remove the dipstick and take another reading. Continue to add oil to the oil fill reservoir until you achieve the proper level.

  7. Replace the dipstick and secure the oil filter cap. Close the hood.

  8. Start your car and check the oil level again while the engine is running 1.