Grasp the ring at the top and gently pull the Toyota Corolla dipstick out of the sheath. Wipe it off with a rag or tissue to clean it.
Notice the two circles on the dipstick. These mark the safety zone for the safe running of your engine.
Slip the dipstick back into the sheath and pull it right out to get a clear reading. Look at the oil level on the dipstick without wiping it off.
Make sure the oil level mark is between the two circles on the dipstick. If it is over the top circle, you need to drain some oil out; if it is below the bottom circle, you need to add oil and recheck until the oil level lies between the two markings.