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Old 03-14-2017, 10:12 PM   #1
JudgeM
 
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Unhappy Excessive oil consumption?

Hi All,

I have a '06 Toyota Blade with 2AZ-FE engine.
Its been less than year since owning it and I've noticed it likes to drink oil.
I see about 2 liters go every 5000km. I spoke to my mechanic and he says its a common problem with this car.

I know North America had some issues with 2AZ-FE however I believe that other regions weren't affected.

My mileage is about 95000km so its not heavily used car, my Vitz was 120000km and didn't burn any oil. Condition of the engine and car upon buying it was excellent, it went for an appraisal and inspection. Compression test all good.

From what I understand, if compression is good, piston rings shouldn't be the issue. I suspect valve stem seals. I changed my spark plugs recently, they were dirty I would say oily and sooty.

Anyway I can test/confirm its valve stem seals, if so whats involved in repairing it ?
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Old 03-15-2017, 10:14 AM   #2
tmontague
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first thing to check is your PCV valve to see if its clogged. If it is this will cause excessive oil consumption and it the easiest/cheapest thing to check so that that first.

If that isn't the problem then yes it could be the valve seals and they can be replaced by leaving the head on the engine if you purchase the proper tool. This will save you a lot of time since you won't have to remove the head.

You can test if it's the rings vs the valve seal by doing a compression test and then adding oil into the spark plug holes and re testing. If the compression increases then your rings are worn. If not then it's likely the valve seals
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Old 03-16-2017, 10:27 PM   #3
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Quote:
Originally Posted by tmontague View Post
first thing to check is your PCV valve to see if its clogged. If it is this will cause excessive oil consumption and it the easiest/cheapest thing to check so that that first.
I checked the PCV valve last time and here's what I found:

PCV was quite oily but it passed blow and suck test.

To check vacuum pressure was ok, I disconnected the vacuum hose from the PCV while engine running. Engine immediately started to shudder and nearly stalled. Is that normal ?


Thanks for the info. If its not PCV then I will ask my mechanic to do test to check valve stem seals.
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Old 03-17-2017, 04:57 AM   #4
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Sticking oil control rings from soot and lack of vent holes on piston .
It wont cause lack of compression because the compression rings are fine.
Try a flush with better quality oil and see it it helps.
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Old 03-17-2017, 12:34 PM   #5
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2AZ-FE....oil burners period , a recall is in effect in Canada , new piston rings ..but from what i hear it dont help...just a bad engine .
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Old 03-18-2017, 04:39 AM   #6
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Quote:
Originally Posted by ncp13 View Post
Sticking oil control rings from soot and lack of vent holes on piston .
It wont cause lack of compression because the compression rings are fine.
Try a flush with better quality oil and see it it helps.
Oh I forgot to mention, that's what my Mechanic said that next oil change I should use 10w30. It had 10w40 before. I just did a oil change recently, will monitor the consumption.
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Old 03-19-2017, 11:50 AM   #7
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Thin good quality synthetic will help flush out gunk .
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