Oil in air filter box/throttle

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My Name: Marcianyn

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Model: C3 2006-2009, Facelift model
Year: 2006 (56)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 75000
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Engine name: TU3 (75 PS)
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Hi all,

Was changing the air filter and noticed that it was really dirty and oily. Upon further inspection I noticed that there was oily residue in both the upper part of the air filter box and the throttle. See images below:
oily air filter.jpg
oily residue on box.jpg
oily residue on throttle.jpg
One suspicion I have is that it is coming from the breather attached to the air filter box.

Is this something to worry about or is it normal?
The car runs fine otherwise as far as I can tell.

Any information will be greatly appreciated.

Thanks,
Marc
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My Name: Arfur Dent

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Hi

You shouldn't be getting this with a low mile engine, but if you have had skipped oil changes or used sub quality oil then the breather can get gunked-up or the rings wear excessively.

Did it get regular servicing?
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My Name: Marcianyn

Top Contributor
Posts: 28
Joined: Wed May 30, 2018 11:01 am
Model: C3 2006-2009, Facelift model
Year: 2006 (56)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 75000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Has thanked: 7 times
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Thanks for the reply.
I will have a look at the service history and see if it has been serviced regularly.
I have changed the oil so far at roughly 10k intervals since buying it and always used the same Castrol oil, so I personally don't think it is sub quality oil that is the issue (although I have been wrong before). Which reminds me I will need to do that soon again.

Is it possible to quickly remove and clean the breather or is it quite the task? (Don't really know where it all connects to)

Thanks,
Marc
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My Name: Arfur Dent

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Engine Size: 1.4 (16v)
Fuel Type: Diesel
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Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
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Marcianyn wrote: Tue May 07, 2019 8:21 am always used the same Castrol oil
Interesting, what actual oil are you using?

The Citroen spec for oil on the TU3 is at least a semi synthetic Total 7000 type at 10w40 with ACEA A3
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My Name: Marcianyn

Top Contributor
Posts: 28
Joined: Wed May 30, 2018 11:01 am
Model: C3 2006-2009, Facelift model
Year: 2006 (56)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 75000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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I believe it is the Castrol Magnatec 10W40 A3 B4 Oil (can confirm when I get back after work).
I tried to make sure that the oil was also 10W40 and A3 rated, not sure if the B4 makes a significant difference. Same for the brand really.

If it does make a massive difference I will move back to the recommended oil by Total.
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My Name: C3CAR

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Marcianyn wrote: Tue May 07, 2019 8:21 am Is it possible to quickly remove and clean the breather or is it quite the task? (Don't really know where it all connects to)

Thanks,
Marc
Yes, you will find it very easy to clean up and the pipe layout will become quite obvious when you take it apart.

Do take photos as you go so you don't need to remember how it all goes back, but there isn't much to the intake and breather side of the engine.
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My Name: C3CAR

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Marcianyn wrote: Tue May 07, 2019 9:35 am I believe it is the Castrol Magnatec 10W40 A3 B4 Oil (can confirm when I get back after work).
I tried to make sure that the oil was also 10W40 and A3 rated, not sure if the B4 makes a significant difference. Same for the brand really.

If it does make a massive difference I will move back to the recommended oil by Total.
Magnatec 5W-40 A3/B4

Engine TU3JP
The Castrol website says is a match for your engine, so this is good :)

You may have a worn engine, that is rings worn and this can create excessive crank case emissions that get caught in the intake system to be burnt again.

After a good clean-up, give it a few services and then check it again. It may have been down to a previous owner?
My Name: Marcianyn

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Posts: 28
Joined: Wed May 30, 2018 11:01 am
Model: C3 2006-2009, Facelift model
Year: 2006 (56)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 75000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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C3CAR wrote: Wed May 15, 2019 10:32 am
You may have a worn engine, that is rings worn and this can create excessive crank case emissions that get caught in the intake system to be burnt again.

After a good clean-up, give it a few services and then check it again. It may have been down to a previous owner?
Thanks for the reply, will do some work on the car this weekend so will have a go at cleaning the intake section at the same time.
With a few services, do you mean like the oil change etc a couple times and over how much time? Really hope it's not a worn engine.

Thanks again for all the info so far.
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My Name: C3CAR

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Posts: 2643
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Each 10k or so, the car gets a service. This includes oil, oil filter, air filter, etc. There is a schedule for the engine you have and this should be followed for the specific mileage for that engine and may include a cam belt change, or some other changes, so it may be more or less than 10k.


Yes, 'with a few services ' i mean after you have done 3 services, which in my example would equate to 30k miles, have another look to see how it is. You can refer back to your original photos for a good comparison.
My Name: Marcianyn

Top Contributor
Posts: 28
Joined: Wed May 30, 2018 11:01 am
Model: C3 2006-2009, Facelift model
Year: 2006 (56)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 75000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Has thanked: 7 times
Been thanked: 3 times

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Right, got it. I was thinking you meant that. Will check regularly (every few months or whenever servicing the car) to see if the oily residue returns.

Thanks for your help.
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