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Pro DRY S replacement with the correct engine and housing
The aFe 31-10225 replaces the original airbox filter in the specified applications with oil-free synthetic media. The exact current manufacturer identifies the F30 328i within a combined 2012β2018 N20 2.0L turbo family. That heading does not establish a US 328i model through 2018 or automatic later B48 interchange. Exact per-part retailer tables identify the original 228i, 320i, 328i/GT, 328d and 428i/Gran Coupe/xDrive model scopes; their individual carried year bounds remain unchanged. The missing 328i xDrive 2013β2016 group is restored from exact per-part tables rather than extrapolated from a rear-drive badge. N47 diesel and N26 gas entries require their documented original housing; a shared 2.0L badge alone is insufficient. The primary overview says cotton gauze while its oil-free Pro DRY S description and current manufacturer media guidance identify synthetic media; some older exact retailer copy describes two layers. Current primary three-layer and 99.2 percent published media statements are qualified without claiming inspection of the actual boxed production revision.
Key Features
- Oil-free synthetic filtration media.
- Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
- Rounded open pleats provide usable filter area and dust-holding capacity.
- Full polyurethane perimeter frame and progressive bump seal.
- The current exact primary publishes 99.2 percent media efficiency but no numerical airflow-gain or engine-power test for this element. This is a manufacturer media statement, not a delivered engine-power guarantee or independently inspected boxed-revision certification.
Fitment
| Detail | Value |
|---|---|
| BMW 228i / 320i / 328i / 428i families | Retain original individually bounded F2x/F3x model/body/xDrive rows; not all 2012β2018 cars |
| BMW 328d / 328d xDrive | Original 2014β2018 N47 diesel housing scopes retained; no generic gas/diesel interchange |
| Restored BMW 328i xDrive | 2013β2016 exact retailer application; no new engine/drivetrain pseudo-trim |
| Media publication conflict | Current primary three-layer/99.2 percent versus older two-layer retailer copy; overview cotton phrase qualified against dry synthetic specification |
| Selection limit | Original element and engine/chassis verification required; later B48 inferred fitment excluded |
31-10225: verify the exact engine, original element and housing. Model or trim names alone do not establish all-engine interchangeability.
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 31-10225 |
| Media | Pro DRY S; oil-free synthetic media |
| Configuration | One OE-replacement air-filter element; original housing retained |
| Pleat description | Rounded open pleats; no verified numeric pleat depth on the exact current primary |
| Frame / seal | Polyurethane perimeter frame; progressive bump seal |
| Service | Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media. |
| Flow statement | The current exact primary publishes 99.2 percent media efficiency but no numerical airflow-gain or engine-power test for this element. This is a manufacturer media statement, not a delivered engine-power guarantee or independently inspected boxed-revision certification. |
| Emissions | Exact manufacturer page states this filter does not require a CARB EO number; other modifications are not certified by that statement |
What's Included
- One Pro DRY S OE-replacement air-filter element.
- No complete airbox, intake tube, sensor, separate coupler kit or filter-service supplies are documented as included.
About aFe Power
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
Related Parts
- Browse aFe Power filter configurations; compare the exact original housing and engine.
- Manufacturer filter-media maintenance guidance; follow the oil-free Pro DRY S cleaning routine.
Frequently Asked Questions
What is the 31-10225?One Pro DRY S OE-replacement air-filter element for the verified housing and engine application described here; this is not a complete intake system.
Which application should I verify?The exact current manufacturer identifies the F30 328i within a combined 2012β2018 N20 2.0L turbo family. That heading does not establish a US 328i model through 2018 or automatic later B48 interchange. Exact per-part retailer tables identify the original 228i, 320i, 328i/GT, 328d and 428i/Gran Coupe/xDrive model scopes; their individual carried year bounds remain unchanged. The missing 328i xDrive 2013β2016 group is restored from exact per-part tables rather than extrapolated from a rear-drive badge. N47 diesel and N26 gas entries require their documented original housing; a shared 2.0L badge alone is insufficient. The primary overview says cotton gauze while its oil-free Pro DRY S description and current manufacturer media guidance identify synthetic media; some older exact retailer copy describes two layers. Current primary three-layer and 99.2 percent published media statements are qualified without claiming inspection of the actual boxed production revision.
Is the Pro DRY S media oiled?Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
Does the flow percentage guarantee more engine power?The current exact primary publishes 99.2 percent media efficiency but no numerical airflow-gain or engine-power test for this element. This is a manufacturer media statement, not a delivered engine-power guarantee or independently inspected boxed-revision certification.
How does this filter seal?Its progressive bump seal and full polyurethane perimeter frame conform to the original housing. The manufacturer says separate filter gaskets or sealants are not required; the existing housing must still close and secure correctly.
Are a hose coupler and cleaning kit supplied?The exact listing identifies an OE-replacement filter. A generic Coupler Included field does not establish a separate hose package; no airbox, tube, sensor, cleaner or oil bottle is documented as supplied.
Does the 2012β2018 heading approve every later 328i or 330i?No. Preserve the original individual N20/N26/N47 housing and model-year bounds. The restored xDrive application is supported for 2013β2016; newer engines and replacement housings need their own exact fitment evidence.
When should I clean it?Inspect according to actual dust exposure and restriction. Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media. Use low-pressure rinse from the clean side toward the dirty side, let the element dry naturally before reinstalling. Do not use heat, compressed air or any filter oil. Do not treat an older general-care mileage example as a guaranteed interval for every vehicle or environment.
Installation Instructions
- Read the exact manufacturer product information for 31-10225 and the original vehicle airbox service procedure.
- With the engine off and cool, compare the new filter and original element, including the sealing interface. Resolve an engine or housing mismatch before installation.
- Open the original housing according to its service procedure, remove the old element and keep debris out of the clean intake path. Clean the housing seat.
- Seat the polyurethane frame evenly without folding the bump seal or adding sealant. Close and secure the original housing and inspect all its attachments.
- Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
No vehicle-specific installation PDF or numeric airbox torque is linked on this exact manufacturer page. Follow the original housing service procedure and the correct oil-free Pro DRY S maintenance directions. Read the manufacturer media maintenance guidance.
31-10225: verify the original filter interface before operation.
California Proposition 65 Warning
- This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
- California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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