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post #11 of 38 (permalink) Old 08-23-2013, 04:22 PM
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Jim, check the oil level to make sure it has not been overfilled. I always ran mine just a little under the full mark. Using one quart of oil every 800 miles is definitely not normal. Have you checked around for any signs of leaks?
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post #12 of 38 (permalink) Old 09-27-2013, 08:57 PM
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Angry oil usage

my 06 prius started eating oil at 125k 1st time i ran some of the 0-50 drove the car for about 3k when i would go around a long corner a waning would pop up on the screen i called the dealer and they said chef the oil and sure enough she was down 2 quarts since this happened i have been checking it and adding oil every 1500 miles my neighbor has 45k on 07 and it was 2 quarts down recently. we both have no leaks under the cars. sounds to me that there is a real problem with this motor!
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post #13 of 38 (permalink) Old 09-28-2013, 09:35 AM
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post #14 of 38 (permalink) Old 09-30-2013, 01:33 PM
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I have a 2005 Prius with 130k miles on it that is burning oil. I'm wondering if using the 'B' mode (engine brake) excessively (around curves, at stop signs and traffic lights, when approaching a slow car ahead, etc, etc) could have caused some abnormal wear&tear to the engine, since 130K seems too young for this kind of problem. Anyone have any ideas?
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post #15 of 38 (permalink) Old 09-30-2013, 04:29 PM
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You should never use "B" mode unless you're descending a long hill. You're wasting energy by using "B" and thus lowering your MPG. And yes, your use of "B" has caused additional engine wear because the engine spins up in the "B" mode, where under normal driving, the ICE would not be rotating and you would be capturing energy by using regenerative braking.

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post #16 of 38 (permalink) Old 10-18-2013, 05:15 AM
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Exclamation Prius using excessive oil

I've got a 2007 Prius (148,000 miles) and have maintained its oil maintenance religiously every 5000 miles! Three oil changes ago there was no oil on the dip stick at oil change time. I started to monitor it closely and found that I am needing to add about 1 quart every 2000 miles. This is VASTLY different than my prior experience as I am the original owner and have always maintained the vehicle according to the manufacturers specs / recommendation and previously I never needed any oil at oil change time.

So I had my last oil change done at the dealer, told them about the issue and asked for a compression check ($109). They found that cylinders 1 through 3 were within normal compression ranges (128-99), but cylinder 4 only had a compression rating of 90. This is VERY disappointing considering the way that I have maintained the vehicle and the large number of vehicles that I have owned and maintained well above the 200,000 mile mark and had no problems with.

Now I guess I need to figure out if the issue is the cylinder / rings, or valve related. I am hoping for valve related because the mechanic informed me that the engine design uses a ceramic cylinder wall and as such can't be machined. I did get the impression that the dealer tried to pass off the notion that oil use on an engine with 148,00 miles is normal. I suspect that Toyota is trying to protect their quality rating with customers.

Does anyone know if Toyota has changed the engine design of the Prius away from ceramic lined cylinder walls?

Thanks,
Pete.

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post #17 of 38 (permalink) Old 10-21-2013, 04:50 AM
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What did the spark plug look like that came out of the cylinder with the low compression? Was it oil fouled?

Also, where do you live and drive? Is your Prius driven in snow and ice, or hot desert heat (or both)?

What engine oil are you using?

The dealer should have checked the inside of the cylinder bore with a bore-scope; and they should know if the cylinder walls are scored. Was this done, or was it an extra expense and not performed? In any case, what did they recommend regarding repairs?

148,000 sounds really low for engine problems, especially on a Prius, when the ICE runs less than on a regular car.

I'd be tempted to find a long downhill grade and run the engine in "B" for several miles (downhill) to try and loosen a sticking ring. (Engine braking raises the engine vacuum and sucks more oil through the rings, which might break it loose, if that's the problem. However, this won't help; if you have worn valve guides.)

You didn't mention what part of the USA you live in; are there mountains nearby where this can be done? The long downgrade out of Yosemite, or a few roads in the Colorado Rockies might provide long and steep enough downhill runs to see if this might help.

Personally, I'd steer away from using STP, Marvel Mystery Oil and similar oil products. They usually cause more problems than they fix; especially in modern engines, where extra oil through the air intake can actually clog and/or ruin the mass airflow sensor and/or catalytic converter.

You may wish to consider having the dealer pull the cylinder to see what's going on. This can be expensive; and it puts you at the dealer's mercy if they decide you need to rebuild the engine. This should probably be a last resort, when you have already decided you want to keep this car even if it requires investing several thousand dollars for repairs.
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post #18 of 38 (permalink) Old 11-08-2013, 01:11 PM
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Default '06 Prius Burinig Oil

Well.. after reading these posts, I should consider myself lucky. I, too, have a Prius that is burning oil. My car has close to 240K on it now. We discovered a few months back it was burning oil at a ridiculous rate between oil changes. The number of miles on my car before this started makes me feel fortunate. I am a commuter in So. Cal and also take great care of my cars.

Barring the usual compression tests and whatnot recommended here, it sounds like the ol' girl is ready for rebuilding. The dealer has already checked for oil leaks and service codes to indicate what the problem is. Nothing came up.

We cannot check the exhaust as we switched to synthetic (I'm assuming it is true we won't be able to detect anything in the exhaust because of it?).

I gave my '06 to my college son to drive since I bought my '12 Prius Plug-in. My '06 has been a great car and the batteries and a few other things have already been replaced. It's just this burning oil problem now.

So, my question is this: Is it worth rebuilding an '06 Prius engine?

Thanks for any feedback.
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post #19 of 38 (permalink) Old 11-08-2013, 02:47 PM
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The question is, how much does it cost for an engine rebuild? Your '06 probably only has a resale value of $6000, and that would be for a car with a good engine. If you put $2K into a rebuild, your car is still only going to be worth around $6K. You won't get your money back, unless you plan to keep the car for several more years.
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post #20 of 38 (permalink) Old 11-08-2013, 07:01 PM
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We have a 2002 and went through a similar buying decision over the summer. In two unrelated failures in about six weeks, we replaced the hybrid coolant pump and then the traction battery -- total, about $3,300.

While this is a lot of money on a car that is worth only a few thousand dollars, the rest of our Prius is in good shape. I figured that I couldn't buy a used car in as good condition for $3,300, so we had the repairs done.

Now, we have a good used car, for the cost of about 7-8 car payments; and it should last another 6-8 years (hopefully).

Of course the decision is yours. However, you may wish to weigh your alternatives and see whether repairs are cost efficient, or whether it's time for a new (or newer) Prius.
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