200tdi oil coming out of air filter box. Help!!

I’m just getting my car ready for mot and noticed whilst it was idling that oil was running out of the beak grommet on the underside of my air filter box. Any ideas on the cause?
The turbo side is clear and that’s good.
I've replaced the cyclone breather and it didnt help, put breather pipe into a container instead of air filter box and had no issues with oil coming out of the breather.
Ran the car without air filter and had no issues.
Put air filter back in and the problem has reoccurred I can see a small amount of oil pooling around the exit of the cyclone breather when the hose is removed at that end but it’s not poring out.
It’s like the turbo is sucking it from the breather and through the pipe as it’s easier to do this than draw air through the filter.

Please help

pictures of the engine bay? I think we all know what a pool of oil looks like under a defender

If the Air Filter is blocked the engine will draw air from the crankcase..
Usually you want to maintain negative pressure in the crankcase with the breather fed into the inlet manifold.
Of course if you have crankcase compression, worn rings, Blow by, etc, you will see engine oil
getting into the air cleaner.. Check engine breather pipes are clear.
You could have crankcase compression.

That

RustyDefender said:

pictures of the engine bay? I think we all know what a pool of oil looks like under a defender

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that photo was to show the amount that is coming out. It won’t let me add another pic now!

timbr00 said:

I’m just getting my car ready for mot and noticed whilst it was idling that oil was running out of the beak grommet on the underside of my air filter box. Any ideas on the cause?
The turbo side is clear and that’s good.
I've replaced the cyclone breather and it didnt help, put breather pipe into a container instead of air filter box and had no issues with oil coming out of the breather.
Ran the car without air filter and had no issues.
Put air filter back in and the problem has reoccurred I can see a small amount of oil pooling around the exit of the cyclone breather when the hose is removed at that end but it’s not poring out.
It’s like the turbo is sucking it from the breather and through the pipe as it’s easier to do this than draw air through the filter.

Please help

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When did you put a new filter in last ?

A good service is called for me thinks, usual cyclone clear out too ...

Enrich01 said:

If the Air Filter is blocked the engine will draw air from the crankcase..
Usually you want to maintain negative pressure in the crankcase with the breather fed into the inlet manifold.
Of course if you have crankcase compression, worn rings, Blow by, etc, you will see engine oil
getting into the air cleaner.. Check engine breather pipes are clear.
You could have crankcase compression.

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It’s a new air filter. But without one fitted there is no issue. How do you diagnose crankcase compression?

Dippypud said:

When did you put a new filter in last ?

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A couple weeks ago once I was sure this issue was cured. It seems having the air filter fitted causes it

timbr00 said:

It’s a new air filter. But without one fitted there is no issue. How do you diagnose crankcase compression?

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Just take off the oil filler cap and put your hand over you should not feel too much blowing on your hand

Have you upped the boost at all, it sounds like the oil hasn't had time to spin out to the side walls of the cyclone ...

Dippypud said:

Have you upped the boost at all, it sounds like the oil hasn't had time to spin out to the side walls of the cyclone ...

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I don’t know how to do that so no

Dippypud said:

View attachment 310133

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I did a compression check through the glow plug fittings readings from front to back 460, 470, 460, 480

steve2286w said:

Just take off the oil filler cap and put your hand over you should not feel too much blowing on your hand

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Nothing significant

The only significant change I can think of is I’m running 10w40 oil instead of 15w40

That wouldn’t affect anything

timbr00 said:

I did a compression check through the glow plug fittings readings from front to back 460, 470, 460, 480

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That’s really good

steve2286w said:

That wouldn’t affect anything

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It’s just that it wasn’t doing it. I changed oil and filters then pretty much found the problem a week later

steve2286w said:

That’s really good

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So good compression, turbo seems good no worn bearings or anything yet it seems the turbo is drawing through the breather instead of the air box when filter is installed. I did change the air filter to turbo hose as mine was a bit knackered. It wasn’t sucking flat but had seen better days. This one seems more rigid

Have you connected the breather/inlet pipes the correct way round? Did the problem exist before, noticed while changing or all happened after you changed things?

Enrich01 said:

Have you connected the breather/inlet pipes the correct way round? Did the problem exist before, noticed while changing or all happened after you changed things?

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I don’t think they can be connected wrong. Problem didn’t exist before as far as I’m aware. All happened after using a different grade oil, oil and air filter change and replacing turbo to air box hose