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X-TRAIL NEWBIE
 


Date Registered: 02-2007
Location: Sydney
TOTAL POSTS: 12
Reply | QUOTE
T30 2002 Sudden High Oil Consumption


Hi all,
Our X Trail has almost hit 200,000 km with a recent cylinder head gasket failure, and cam sensors being the only problems in the past 120,000km of ownership. Oil consumption was always zero or close to that between services ie never fall below minimum in 10,000k's.
However now we are adding oil fortnightly and its disappearing off the dipstick at an alarming rate. There is also new signs of seepage from the head and rocker cover but not enough to leave drips overnight when parked. Prior to this the engine has been 100% dry.
What i did find was, whilst idling, I removed the oil filler cap on the rocker cover and whollah, it almost fired out of my hands due to being reasonably pressurised. Maybe an exageration there but the pressure was really evident. Removing the rubber line indicated some vacuum, but obviously not enough to vent the pressure build up.
What is normal here? Should there be any pressure in the rocker cover? Is there a PCV valve that could be the issue? I couldnt see anything in line rubber hoses. A diagram or a pic would be helpful if anyone has one.
Many thanks in advance.



---
Cheers

Bruce
2002 Ti, Twilight,
Leather, 5 Speed
29/Oct/2013, 8:47 pm Link to this post Send Email PM   Send Private Message
 
DJR9000 Profile
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X-TRAIL ENTHUSIAST
 


Date Registered: 08-2012
Location: Blue Mountains NSW
TOTAL POSTS: 169
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Re:


What grade of oil are you running?

You could always get some carby/brake cleaner, take off the PCV hose and breather hoses and give them both a squirt to clean them out. The breather runs from the right hand side of the engine above the cam angle sensor to the intake piping, the PCV is on the rear of the rocker cover and the tubing goes into the intake manifold from memory.

If it is leaking out of the rocker cover gasket then the rocker cover may have been overtightened or undertightened when reinstalled, or reinstalled without a new gasket or with new RTV silicone up on the left hand side where it needs to be according to the service manual

There is always a little bit of blowby pressure, normally at idle the PCV should be closed, it opens up with throttle/vacuum. With 200K on the clock though it'll be making a little more blowby. Also check for signs of smoke through the exhaust, either constant (piston rings most likely) or after long periods of idling (valve stem seals)

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Ben
Hazelbrook, Blue Mountains NSW
2002 T30 Ti Dark Blue Mica
20/Nov/2013, 7:13 pm Link to this post Send Email PM   Send Private Message Blog
 
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X-TRAIL ENTHUSIAST
 


Date Registered: 08-2012
Location: Blue Mountains NSW
TOTAL POSTS: 169
Reply | QUOTE
Re:


Argh, just remembered after posting that out.

Oil consumption issues on the QR25DE, esp suddenly, are often due to the catalytic convertor in the exhaust manifold breaking down, being sucked back into the motor (due to valve overlap instead of EGR) and scoring the cylinder walls, causing high oil consumption.

If you can, remove the O2 sensor from the manifold and have a good look, search on here there is a lot of talk about it. If it's happened to you - well - time for a wrecker engine...

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Ben
Hazelbrook, Blue Mountains NSW
2002 T30 Ti Dark Blue Mica
20/Nov/2013, 7:15 pm Link to this post Send Email PM   Send Private Message Blog
 
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X-TRAIL FANATIC
 


Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
Reply | QUOTE
Re: Re:


It does seem odd that you have a sudden, rather than gradual increase in oil usage.

Have you tried driving down a long hill (without any use of accelerator) using only engine back-pressure, then at the bottom of the hill - rev it up while stationary and in neutral?

If you get clouds of blue smoke from the exhaust, then there is probably a problem with the oil rings.

Compression rings are easily tested with a SuperCheap gadget or by your mechanic.

If it blows smoke at the bottom of the hill, your oil may be going out the exhaust pipe.

If there is no smoke, then the cause is elsewhere.

(That always worked as a simple test for the older cars but of course it may not be applicable to this new generation).

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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT : + some gadgets and cosmetic add-on's. Dirt, (it protects the paintwork) X-2429(c).
25/Nov/2013, 9:42 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 04-2012
TOTAL POSTS: 14
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Re: T30 2002 Sudden High Oil Consumption


Hi!

My 2002 had a head gasket leak also, and now 2 years later she has started burning a lot of oil, and she also weeps oil around the rocker cover. I don't know if this means my engine is done for. Either way I am replacing the maniverter due to P0420 code and then trading her in for a 2.2 DCI (or possibly a newer Subaru Forester).

Also let me add that I run 10w40 synthetic oil, premium brand -- and I do oil/filter service every 12000km/1 year (whichever comes first).

Good luck!



Last edited by jalalski, 12/Sep/2015, 4:03 am
11/Sep/2015, 11:43 am Link to this post Send Email PM   Send Private Message Blog
 


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