One problem related to engine exhaust system has been reported for the 2013 Toyota Prius. The most recently reported issues are listed below.
Currently using approximately 1 quart of oil per 2,000 miles. That comes out to 5 quarts per 10,000 mile oil change--which is more than the 4. 4 quarts that the car holds. No drips under the car. No clouds of smoke out of the exhaust. The oil usage slowed down, when I tried using castril full synthetic oil--at the suggestion of a neighbor of mine, instead of the Toyota dealer oil and mobil 1. It is a concern, that the exhaust system might be plugging up--due to this oil use issue. I have an extended warranty to 200,000. The warranty company told me today, that, they will only cover internal engine part breakage, or whatever my factory warranty was. They will not cover the cause of the oil use, and they will not cover damage caused by lack of oil. So, I was told, to make sure I keep it full of oil. Toyota should consider how this will affect their future business. A big sales point to the Prius is, that, it should last a really long time. It may last a long time, yet. I'll keep adding oil and we shall see. In the mean time, I plan to get a road side assistance package that includes towing. . . .