Oil Separator Membrane 52mm – Volvo 2.0 2.4 2.5L B5254T / Ford | OEM 31338685 30788494
A failed 52mm oil separator membrane causes oil mist in the intake, oil consumption, and crankcase fault codes on Volvo B5254T and compatible Ford platforms. Direct replacement for oil filter housing assemblies using OEM 31338685, 30788494, 31338684, or Ford 1781598. Volvo C30, C70, S40, S60, S80, V50, V60, V70, XC60, XC70, XC90 (2.0/2.4/2.5L B5254T, B5244S engines); compatible Ford models
Fits OEM #30788494.
When to Inspect This Part
- whistling or excessive crankcase vacuum
- rough or unstable idle
- increased oil consumption
- oil residue in the intake
- smoke after warm-up
- mixture faults or an intake air leak
What's Included
- 1 × Oil Separator Membrane 52mm
OEM Part Numbers and Vehicle Fitment
Additional confirmed fitment
- C30 2006-2013
- C70 2006-2013
- S40 2004-2012
- S80 2006-2016
- V50 2004-2012
- V70 2007-2013
- Focus II 2005-2008
- Focus II 2008-2011
- Kuga 2008-2012
- Mondeo IV 2007-2015
- S-MAX 2006-2015
Part Number / PN
30788494, 31338684, 31338685, 1781598, 30677920, 3911117978, 39 111 17 978
Important Fitment Check
Before ordering, compare the part design, dimensions, connectors, and every available OEM/P/N marking with the part installed on the vehicle. Matching OEM/P/N 30788494 is the primary fitment check.
FAQ
How do I confirm fitment for this Oil Separator Membrane 52mm?
Compare the exact OEM/P/N and physical design with the installed part. The primary reference is 30788494. Do not select the part by vehicle model alone.
What symptoms may indicate a problem with this Oil Separator Membrane 52mm?
Confirmed symptoms include whistling or excessive crankcase vacuum, rough or unstable idle, increased oil consumption, oil residue in the intake. Diagnose the original assembly before ordering so another fault is not mistaken for this part.
What is included with this Oil Separator Membrane 52mm?
The confirmed kit contents are: 1 × Oil Separator Membrane 52mm.
Does this listing include the complete surrounding assembly?
No. It includes only the item or repair components identified for this SKU. Inspect related parts separately and replace them only when diagnosis confirms a fault.
What should be checked before installation?
Check the OEM/P/N, dimensions, connectors, orientation, and condition of the mating components. Installation should follow the correct service procedure for the specific vehicle and assembly.
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Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings