Pull it back out, and this time look at both sides of the dipstick to see where the oil is on the end. Every dipstick has some way of indicating the proper oil level, whether it be two pinholes, the letters L and H (low and high), the words MIN and MAX, or simply an area of crosshatching. If the top of the oil “streak” is between the two marks or within the crosshatched area, the level is fine.

But if the oil is below the minimum mark, you need to add oil.

1. Use the grade of oil recommended in the owner’s manual. It will usually be 0W-20 or 5W-30. You can buy it at any service station or auto-parts store, as well as in many supermarkets and discount retailers.

2. To add oil, remove the oil filler cap, usually located on top of the engine. Since over-filling with oil is bad for the engine, you should add oil a little at a time. Using a funnel helps avoid spills. Wait a minute or so and check the dipstick again. If the level is still below or near the minimum mark, add more. Unless your engine is leaking or burning oil (or if you haven’t checked it in awhile) you will rarely need to add more.

3. Screw the oil filler cap back on securely, and you’re done.