2010 Prius using 1 quart per week (500 miles +/-)
I have a 2010 Prius IV with 116,000 miles. At about 90,000 miles, oil consumption rapidly increased. When I finally realized that the yellow triangle on the dashboard means low oil, (the diagnostic panel said "low engine oil pressure") the car was down 3 1/2 quarts. I brought it to the dealer the following day. I have owned a Landcruiser for 15+ years and it has never used a teaspoon of oil. What's up with the Prius?
The dealer acted very concerned - said that they had never seen this. I now see from this forum that this is a lie. We did three oil consumption tests, with anywhere from 1/2 to 1 quart per 500 miles for a 2,000 mile test period. They suggested that I need to either rebuild engine, for low $2800 to high $5,300 or trade it in. They cannot identify a location of oil leakage, and showed me burn residue on spark plugs. They had a factory rep come look at car during one test period. Unfortunately, he was no help to me. We have never seen any smoke emitting from the exhaust pipe.
The first scheduled tune up for this car occurs at 120,000 miles. We use synthetic oil, and have changed oil religiously every 10,000 miles. I am deeply disturbed that I'm told to rebuild the engine (at a profit to the local Toyota dealer) prior to my even getting to the first scheduled tune up!
Toyota has offered to give me parts at 30% off list, and will "loan" me a car during the rebuild period. This does not seem like enough to me. Granted, owning a car is a crap-shoot, but this experience does not speak well of current day Toyota's.