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Discussion Starter · #1 ·
Hello friends,

please excuse my spelling, I'm working with Google Translate.

I live in Germany and drive a Nissan X-Trail with QR25DE engine.
I have the problem that I consume 0.3 gallons of oil to 200 miles.

I think that the oil consumption is way too high.

before 1000 miles I have replaced the cylinder head, while the cylinder on
Running tracks and shouted investigated. It all looked good.

The valve stem seals are ok and there is no blue smoke.


I was thinking that the PCV valve is permanently open and is therefore sucked in and burned too much oil vapor.

In Germany the QR25 engine is unfortunately very rare and only a few people
know all about it.

What are your experiences? Can the amount of oil consumption caused by a broken PCV valve?

Thank you for your help

Greetings from Germany

Feuerdaniel
 

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The motor is known to consume oil here in the U.S. and at higher rates then what you have experienced. Some have tried different weight oils and I believe it has helped but I never followed up on it. If the motor is not stalling then I would believe that your PCV valve is fine.
 

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Discussion Starter · #4 ·
Hello friends,

thanks for the answers.

I have always driven motor oil 5W-40. I have now tried 10W-40 to drive
but the oil consumption has changed nothing. I will at the next oil change
Try 15W-40 oil.

The Pre-Cat has already been renewed and the Butterfly screws would also tested and used with Loctite.

The engine runs really well. Only when it is cold the engine runs a little uneasy or out of round. It is hard to describe. It is then like a tractor or a marine engine.
After a few minutes everything is good though and it runs smoothly.

There are no DTC codes stored.

I'm going to go first on and hope that he still holds many kilometers.

Greetings from Germany
Daniel
 

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When you say that the pre-cat has been renewed, do you mean that the old one broke apart and was then replaced?
 

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Discussion Starter · #6 ·
The old Pre-Cat was brocken.
So i have to become a new one in 2006.

the Oil consumption was all the Years okay. But since 2012 it was more and more.
 

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You don't want to have a precat at all, unless for some reason in Germany that is impossible. If possible, put on a header without a catalytic converter on it.
 
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