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post #1 of 38 (permalink) Old 07-06-2011, 08:46 PM Thread Starter
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Default Oil useage

My 2005 Prius with 180K miles is using a quart of oil every 2K miles. Has anyone had experience with this?
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post #2 of 38 (permalink) Old 08-13-2011, 01:53 PM
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Default Re: Oil useage

If it's not leaking on the ground, you may be approaching ICE repairs. Our 2002 Prius still goes 5k to 7.5k between oil changes with no noticeable loss of oil. However, we only have about 115k miles on it.

If the ICE is burning the oil, it means that either the valves/valve guides or piston rings are letting the oil get into the combustion chamber. A quick way to check is to run your finger inside the exhaust pipe (before it gets hot from the ICE running). When burning progresses, you'll see a significant increase in black oil soot coating the inside of the exhaust pipe. In severe cases, it'll be wet oil residue (actual oil, not liquid water).

Of course, the best way to check is to have the cylinder compression checked. This isn't difficult, although it may seem daunting if you have no engine repair experience. It shouldn't be too much at the dealer, although everything is relatively expensive there. However, it seems really low mileage for ICE problems, unless your vehicle has been abused or in an accident that my have caused related problems.

I don't think I remember anyone ever overhauling an ICE on this site. With the electric motor sharing the load, I would expect that the ICE would last significantly longer than in a regular automobile. And, Toyota engines usually run a long, long time before needing a valve job or engine overhaul, typically 250k+ (assuming normal driving conditions/habits and routine maintenance was done regularly). Therefore, I would expect the ICE to last quite a bit longer than the mileage you have on your car.

Let us know what you find after checking the compression and the exhaust pipe.
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post #3 of 38 (permalink) Old 12-04-2011, 02:27 AM
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Default Re: Oil useage

My 2005 with 146K miles has a similar problem. It used 1 quart 1000 miles since the last oil change and on the last 3 oil changes the low oil light came on just before the 5000 mi oil change was done. The dealer and the oil change shop could not find any leaks. But I am wondering if the oil issue is due to the engine working harder lately as the battery seems out of juice going up hills and the electric motor cuts out, yet dealer can't find any fault with main battery pack - only changed the aux battery at cost of $300+ They also did a Throttle Body Cleaning for another $150. The car's performance did not improve... I am wondering if they are avoiding condemning the battery pack since it is still under warranty...
Anyone have any answers for the problems?
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post #4 of 38 (permalink) Old 12-06-2011, 08:49 AM
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Default Re: Oil useage

Battery problems will not increase oil consumption. I am puzzled why your dealer hasn't pulled the spark plugs to look for oil fowling and also checked the engine compression. Excessive oil consumption (not from leaks) is usually through the piston rings, valve guides or other ICE-related problems (ERG system, etc.). This is NOT a hybrid (electrical/electronics) system problem.
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post #5 of 38 (permalink) Old 12-28-2011, 10:46 PM
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Default Re: Oil useage

Have the same problem with 08 Prius Notice it is buring about 1.25 quarts per 5000 miles. It have a 139,000 miles and i am running synthetic. Should i change to conventional motor oil. Would the viscosity difference prevent some of the blowby?
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post #6 of 38 (permalink) Old 12-29-2011, 11:45 PM
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Default Re: Oil useage

The parts guy at O'reilly's suggested I use the high mileage additive and run 10w40 ( heavier weight). I topped off with the additive and the 10w40. Not sure if it is doing trick but engine seems smoother after adding the quart. The dealer is supposed to look at the motor next week....and re-check out the main battery. They have had only one engine re-build at 150K on their shuttle. The independent Prius shop in our area has only rebuilt a couple of motors at 150K (both are taxis) most rebuilds are 250K motors in taxis (we have lots of Prius taxis in San Francisco) both the dealer and the independent shop says motor should go 250K...not sure why some go bad out at 150K... Any thoughts anyone?
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post #7 of 38 (permalink) Old 05-14-2013, 08:46 PM
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I have a 2008 Prius with only 113,000 miles on it and it started burning oil. I am very religious about changing my oil every 5000 miles. Took it to the shop to see what the problem was. shop guy said there was no oil leaks. I am not happy with this. The engine starting and stopping is taking a toll on the engine, no oil pressure during the few moments at start up causing excessive engine were. I will never buy a hibrid again.
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post #8 of 38 (permalink) Old 05-15-2013, 11:51 PM
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Hi, shastababb,

I remember reading here early on that one of the motor/generators is supposed to spin up the engine to about only 1,000 RPM's (without fuel or spark) to build up the oil pressure before starting the engine so dry parts wouldn't be rubbing against each other creating un-necessary wear.

I should really start regularly checking my 143,000 mile engine between oil changes to see how much oil is disappearing over 5,000 miles. Right now I'm down about half a quart for the last 3,000 miles.

Ken (in Bolton,Ct) 2005 Pkg #4 (AM)
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post #9 of 38 (permalink) Old 05-30-2013, 05:13 AM
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If oil level drops between oil changes, and you don't need to add a quart before the next change, that's about normal for an older engine. Personally, I would not worry about using less than a quart between oil changes. Also, Toyota used to recommend 7,500 mile oil change intervals, unless you drive in extreme conditions. Consumer Reports also recently recommended this interval, stating that for newer cars, the old 3-5,000 mile rule wasted oil.

Quick check: Before you start your car in the morning, stick your finger up the exhaust pipe and swipe it around. Gray to black soot is normal. However, if your finger is wet with oil, then too much is getting past the valves or rings; and you may need to troubleshoot further.
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post #10 of 38 (permalink) Old 08-23-2013, 02:34 PM
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Have a 2006 with 155,000 that suddenly started using oil at 1QT every 800 miles. Will run a compression check and look at plugs. I do not expect low compression or any internal engine damage. Synthetic 0-30 at dealer every 5,000 miles. Synthetic does not smoke on burning and there should not be carbon dust in exaust. This much regular oil burn would ruin the converter. I suspect the Crankcase Vent Valve system. On hard acceleration I occaisonally get a power loss that is like the carb flooding of a day gone by!

Jim O
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