at around 110,000, mechanic started noticing there was not enough oil left when he did oil change. Kept eye on it. When it got to be that I had to add 2 - 4 quarts between oil changes, I called Toyota and they said to have an oil consumption test done. What a waste of time. It is burning a little less than 1 quart per 1,000 which is in specifications. Even it if was burning more, they said they would do nothing. I will call Toyota back and get a case number and complain. This was my first Toyota and my last.

So I purchased a 2010 Prius in Feb of 2015. Side note: I also own a 2007 Camry, about a 2 years ago I checked the oil in the Camry one day just out of curiosity and it was barely registering on the dip stick, I was shocked and immediately put in more oil.. I wasn't sure what to do- the car was out of warranty and I felt like a Toyota should not be using this much oil (if any at all).

For the next two years we just kept adding oil almost every week. Eventually we got a letter in the mail saying that many Camrys were experiencing the same issue and that we could have it fixed for free. This was good news and we are currently in the process of having the car taken in for repair.

Ironically I stumble across this website and see that the main problem for the 2010 Prius is also oil consumption. I bought my Prius certified at the local Toyota dealer a year ago and have always had timely maintenance performed at the dealer, the owner before me did as well. So I'm thinking I should be safe since the car has been greatly cared for. Turns out I was wrong. I check the dipstick in the Prius yesterday and it is in between the low and full marks. This is quite ridiculous. The car should not be using oil with being under 100k miles and always having the oil changed at the dealer.

All I guess I can do now is call the dealer and see what they have to say and I guess hope that Toyota will fix the problem on the Prius models for the issue as well. Come on Toyota, my family and I have been LOYAL Toyota owners for a long time and planned on being in the future. But if the quality of your vehicles keeps slipping from what they use to be then I may look elsewhere next time I purchase a vehicle. I spent more money to buy a Certified Toyota vehicle than a Ford because I thought it would be like the old Toyotas I've owned.

I bought a 2010 used Prius in October and it had 79000 miles at that time. I do a lot of highway driving and I am having to put in 2 Quarts of oil a week! I have taken it to the dealership and I am on my second oil consumption test. I have never owned a vehicle that consumes this much oil! The cost of oil has out weighed the gasoline savings. I am not even seeing that much of a savings on that either. I previously owned a 2006 Prius and got great gas mileage and had regular oil changes at a normal rate like any other vehicle. What is the problem with the 2010 Prius? I hope I can trade it in.

My 2010 Prius was taken in for an "Excessive Oil Consumption Test" where the dealer sealed all oil ports and instructed me to return after 1100 miles. I returned with 89091 miles on the vehicle (1103 from test start point).

The vehicle had consumed 3/4 qt in 1103 miles. (Translates to 6.8 qt between changes).

I have an extended warranty that covers the vehicle to 100K miles. The dealer informed me the warranty would not cover the repairs as my oil consumption was less than 1.1 qt/600 miles! That translates to 18.3 qt between oil changes! That's EXCESSIVE no matter what you drive!

I called Toyota: 800-331-4331 and was issued Case# 160 219 1174 and told I had no recourse.

This is absolutely absurd! I've owned many cars over the years (including three other Toyota vehicles) and NOT ONE has ever had an oil consumption rate this high.

What can I do to get this remedied?

My 2010 Prius has never needed more oil in between changes. I felt stupid for checking it between 10,000 oil changes for the last 6 years since it hardly ever dropped. Then at 77,000 miles, my engine made a belt-screeching sound (only once) and then randomly started making odd buzzing sounds after starting it. I thought it sounded like the hybrid battery bugging out until I got the old orange triangle with exclamation mark light on the dash when braking, mostly while turning. After Google various solutions, I narrowed it down to low brake fluid or oil. Brake fluid was fine, so checked the oil and to surprise, it didn't even register on my dipstick. After adding 1 quart of oil, it registered extremely low. Back to Walmart I will go! I do drive mostly highway miles between 65 and 80 MPH, always had regular maintenance done. Sad to learn that my car will need a quart ever 3,000 miles or so but I will still enjoy a huge gas savings.

Took the car in for an oil change. The service manager said that it wasn't time for it as the car only had 8,000 miles instead of 10,000, I told him that I wanted everything checked out as I had lost 10 MPG in mileage per gallon and there was something going on. I was about to hit the 100,000 mark and the warranty would expire. so I wanted to make sure that the car was okay. When I picked it up he said that everything checked out but that I was a quart low on oil. Then in December I was driving it and the warning light was coming on. I stopped and check the oil and it was three quarts low. I had gone only 5,000 miles. This is not good. I'm going to monitor it and see where it's at in another 1000 miles.

Around 70k miles my 2010 Prius II, like tons of others, started BURNING excessive oil - the noxious byproduct of this defect then floods the cabin of the vehicle anytime there is a strong acceleration. The car is now at 170k miles thanks to my adding of oil multiple times a month. Every dealership I took it to over the last few years I have reported the issue and was told it was normal. Checks were done and no leaks were found.

Yesterday my check engine light came on. I took it to the dealership and they tell me soot has caked some valves and gunked up the engine which is going to cost a lot to replace and repair. They tell me it could have been bad gas. I ask if it could be from all the oil its burning, they tell me yes. Toyota needs to stop the denials and recall the engine ASAP.

Purchased a 2010 Prius new. In July, 2015, a light kept flashing on the dash and going off. I took it to the dealer and they told me the car was over two quarts low on oil. This is the fifth Toyota that I have owned and I have NEVER had to add a quart of oil between the regular oil changes. The dealer put the oil in the engine and told me to write down the mileage and keep an eye on the usage. After approximately two months and 2500 miles, I checked the dipstick and couldn't see any oil. I took it back to the dealer where they did my regular service, including changing the oil. Again, they told me I was about two quarts low on oil. They told me to continue to monitor the problem and the service manager said he would check into what Toyota is suggesting as a solution. Added two more quarts of oil in November, 2015 after another 2100 miles. In January, 2016 the service manager called and told me that his Toyota contact told him to tell me that "adding a quart of oil every 600-1000 miles is "normal." The service manager and I both agree that this is not normal oil usage. He recommended I call the Toyota Customer Service number and get a case number. I have done that and am waiting to hear back from them. I don't have a whole lot of faith that anything good or helpful will come out of it. I did tell the dealer and the customer service rep that if I have to get rid of this vehicle and take a financial hit, it will be the last Toyota that I will ever buy. I don't think they care one bit.

I had to take my car to dealer because check engine light was on, service man reported that my engine oil was very very low. It was a surprise find for me, as oil change was not due. Since the previous oil change was not done at dealer, they said wherever I had oil change did not fill in enough oil. The did the oil change. For the next oil change ( way before the oil change was due, approx 6kmiles) same story, they reported oil level was too low. Since it is under warranty I asked them to fix the problem. Surprisingly the dealer still does not believe that there is a problem. Wants me to monitor the oil consumption. not happy with toyota cars .. will trade in soon

8/27/15: Oil light on, added 4 qts. synthetic oil, took Prius to Capistrano Toyota, was told they'd do an oil consumption test, but found that there was an oil leak in the timing belt cover ($2100 to fix). did not fix at the time. The Prius had 88,613 miles on it at the time. I'd never experienced any such trouble in the 5 years we've owned the car. Up to this point I was very happy with the car. I didn't suspect other than the oil rings might be worn, (but not at 88 thousand miles).

Update from Nov 15, 2015: I took the Prius to HYBRID 911, a specialty repair facility in Westminster, CA. (Mileage 88,664). They looked at the car to see about the leak, gave me an estimate or $710. I had them repair the car on 9/3/15. Shortly after that I began to have an irritated throat and became hoarse when I drove the Prius. I took the care back to them, they could not see any further leaks. I drove the car for 2-3 more weeks. Each time, I noted a sore throat, and hoarseness.

On 9/30/15, I took the car to Elmore Toyota in the City of Westminster (mileage 89,193). I told them of the smell of oil in the cab, and that I was getting a sore throat/hoarse when I drove the car. They suggested i have the Air conditioning evaporator system cleaned - did so @ $154.43. The car seemed to be OK for a short while, until I checked the oil to find that it was low on oil again. I put in 4 qts. of synthetic oil. Again, on or about 11/9/15, I checked the oil to find it didn't register on the dip stick. I added 3 qts. of 0W 20; and, that seemed to bring the oil level up to the second dimple on the stick. Still, when I drive around, i get a sore throat, and become hoarse.

I haven't been told by Toyota of any inordinate oil consumption. However, I have read in the meanwhile on "CarCompliants.com" that about 300+ owners of a 2010 Prius have had similar problems when the car has from about 90 to 110 thousand miles on it. The owners took it to Toyota to be told that it uses a bout a quart of oil every thousand miles (that was "normal" consumption).

I'm very angry @ Toyota because of the above situation! For one thing, a quart of synthetic oil every 700-1000 miles (@ $10 ea) is an expensive problem. I've usually added 3-4 qts at a time, so it may well use more than an qt. each time I add oil. Additionally, a sore/hoarse throat, from the toxic fumes (somehow they get into the cab), is a serious health problem. One woman about whose accounts I read documented very accurately her problem; and, Toyota gave her a new engine. I will continue to explore this problem with Consumer's Affairs, the Bureau of Automotive Repair, etc. to try to get some resolve with this problem. We paid handsomely for our Prius! I owned numerous Toyotas, and never had such problems! Toyota needs to be straightforward with this problem. I'm not sure what to do. The consumption problem makes the car worth much less on the open market; and trade-in value will plummet as well. I was some answers, and some help to resolve this serious problem! This is not the end!

I added 4 qts. 0W20 synthetic oil on 11/25/15, as the three quarts of same added just 550 miles before were gone! The car continues to leak fumes into the cab, causing hoarseness and sore throat each time I drive it. So far, no dealer I've visited has any information about this problem. However, I've heard of a couple of people owning 2010 praises having their engines replaced by Toyota.

I will try to contact them as my goal is to have our engine replaced as well. For Toyota to engineer a new technology in their third generation Prius: and for me to have bought same, trusting that Toyota would prevail as the leader in Hybrid technology, only to find that the engine fails at 90 - 110K miles, when any such new car should easily go much farther before needing major overhaul. I trust Toyota will act responsibly, and not ignore this serious problem.

Update from Dec 4, 2015: Talked to another 2010 Prius owner who had a 2 yr. battle with Toyota of Capistrano. She EVEN HAD and extended warranty, went to their service dept. every time the "oil light" when on. They finally rebuilt her engine! But what's to stop it from developing the same problem @ 90-110K miles, or so!! I was given the name of a service writer: Jake Grommet (sp?). I called today 12/4/15 to find that he left Capistrano Toyota in July. What to do now? I'll have to explore some other options, for other service writers either are unaware of the problem (difficult to imagine), or are ignoring it (spelled "cover-up"?). Either way most Toyota dealers are no help. In the meanwhile, I add expensive synthetic oil, and breathe in toxic fumes which cause hoarseness, sore throat, etc. I don't think Toyota is going to step up without some "external nudging" (e.g. class-action law suit). It looks as if Toyota failed to manufacture an engine which would last long enough to get off their lot! (Not so funny)… I am very angered that I spent my good money (they had no difficulty spending it) on their breakthrough technology, only to have the engine wear out in 90 thousand miles (or so)!!! I'll soon check the oil to find out home much has been used (or how much is left from the 4 qts. added on 11/25/15…TO BE CONTINUED...

Update from Dec 17, 2015: Now with almost 92,000 miles on the odometer, our Prius continues to burn oil! Not only that, but fumes leak into the cab causing sore throats and hoarseness. At first this car was fun to drive. I appreciated the economy of it; and, that oil changes every 10,000 miles were covered by Capistrano Toyota. My opinion of this car (and Toyota) has changed radically! For Toyota to engineer such a car, find that the engine breaks down after 90-110 thousand miles is horrid!! I'd be glad to join a class-action suit against toyota for repair and damages to our health. This occupies the bulk of my waking thoughts; and I hope to get some resolve from Toyota!!

Consistent dealer maintenance since purchased (12/31/2009). Started to notice occasional beeps when braking, often on a corner, 6000 miles after last oil change (@96k miles). A week later caught the triangle-! light; took to dealer that day. Engine found to be 3-1/2 quarts low.

Service advisor explained, because of frequent engine starts, that rings on on Prius engines are "loose," and further suggested starting a high-mileage oil.

On being asked, service advisor also mentioned technicians would have said something if oil had been low on previous maintenance visits.

Oil was topped off and car washed without charge. I was told the dipstick had been marked, and to return in 1500 miles to check the level. At first--given the "comp" service--I thought maybe technicians forgot to add new oil at the last change, that it wasn't caught before I left (no, I didn't think to check), and that this great car managed to get through 6k miles on 1/2 quart of oil. Not so sure now.

Five hundred miles to go before returning to the dealer. Checking the oil this morning showed somewhat low from the mark--maybe 1/2 quart.

Update from Dec 5, 2015: Returned to dealer 1388 mi later for 1500 mi check. Dealer said the car was down 0.3 quarts (1qt in 4600 mi), within manufacturer tolerance. Again topped off at no charge. FWIW, when first brought in, consumption came out to 1 qt in ~1900 miles; factor of two difference.

I asked what it would take to diagnose and fix the problem. Service advisor did not directly address diagnosing the issue, but said these engines generally are not repaired, but fixing it would require a short block exchange at $6000-7000. Advisor relayed technician recommendation was to routinely check oil and top off as needed.

Considering seeking a non-dealer opinion from an independent shop (someone who won't parrot the party line).