Prius (2004-09) :: High Oil Consumption At 200,000 Miles


Aug 27, 2014

I have noticed my oil consumption has jumped to 1 1/2 quarts at 3000 miles..(it has been changed every 3 to 4000 miles) and is always very dark.. There's no leaks and the spark plugs were clean (just a little ash) when I changed them with the last oil change. No smoke from the tail pipe and the car still gets 45/48 mpg ..

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The oil consumption started around 90-100k miles. My wife mostly drives the car so I just check it and fill it without keeping track of mileage. Last week I had a lot of driving to do so I topped off the oil before starting my trip and put a 5 qt 5-20w bottle in the back. I've been through two liters in 2100 miles! Sheesh - I'm ticked off. I do my own oil changes at least every 10k miles, always use 0-20w or 5-20w full synthetic oil (usually Mobil 1). I replaced the spark plugs at 119k miles per maintenance schedule.

Besides the oil consumption, since 115k miles the engine can get into a mode where it misses a little bit at low power once it is completely warmed up. I have a good code reader and nothing ever shows up. I expected the new spark plugs would fix it, but they didn't change anything about how it runs. It is slowly getting worse. I'm going to wait until a code in the ECU is set before fixing it. It could be an ignition coil. I suspect it is an O2 sensor which causes the AFR to be too lean which makes the mix hard to ignite. Time will tell. It runs fine when cruising at highway speeds.

We bought this 2010 Prius III, not 3, new in October 2010. The only out-of-the-ordinary thing we do is live in northern Wyoming where it can be very cold for a long time. We drive 85 mph for long distances to go shopping and visit friends. The gas mileage is the same as it has always been. It varies between 42 and 50 mpg in the summer and 35 and 45 in the winter.

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If I plug in my IPhone 4 using the USB cord plugged into the receptacle under the armrest (how you plug in to run the wonderful entune ) the pictured notification intermittently and quite often pops up. This stops my phone from charging and is annoying as it makes the dinging sound every time and I have to unplug / re plug it in and hope that it starts back up charging. Does the little lightning bolt that signifies that the phone is charging must be on for entune to work, or does it only have to be plugged in??

Now I do recall somewhere hearing that the USB is not the optimal way to charge a phone, and I'll admit when it does work it charges real slow. Thing is that's the only way to run Entune and there is only one plug on the cell phone? I could charge the phone via a cigarette lighter charger but then I can't use entune!

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When I go out to do errands around town (I live right in town) I get horrendous gas mileage. Now, I understand gas mileage is high at the beginning of a trip, but for this long and this high and under these circumstances? I'm getting ABOVE 10l/100km when I have 80% charge available (for americans, that's disgustingly high MPG like, pick-up truck high), AND my foot is completely off the gas. Literally, coasting, or braking, and I'm still sucking up gas. What the heck?

Is this just because it takes a certain amount of time for the engine to run no matter what or something? I still don't see any reason for me to be eating up all that gas when my foot isn't even on the gas AND most importantly, I have charge available. Feels pointless for me to use my car for what I use it for 70% of the time, which is for quick errands around town at low speeds. Thought the prius was suppose to be a superstar for this kind of thing.

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