Just changed the oil in my daughters 1.8 and everything went fine until I got home and poured the waste oil in an empty 5 qt contained and noticed there was only 3 qts. I added 4 qts of oil but only drained 3. I let the oil drain about 20 minutes and the engine was warm when it was draining. She was in a hurry and when I checked the dip stick it seemed high. I have done multiple oil changes and never had this happen. It's as if a qt failed to drain.