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Pro DRY S replacement with the correct engine and housing
The aFe 31-10047 replaces the original airbox filter in the specified applications with oil-free synthetic media. The current exact manufacturer identifies BMW325i/e/es/ix E30 and520i/525i/525e/528e/530i/535i E28/E341986–1994 L6 M20/M50/M30 applications. Its dedicated Pro DRY S section specifies THREE progressive non-oiled synthetic layers; the overview instead says cotton gauze, a wording conflict that does not authorize oiled-filter servicing. Exact dry-part retailers also positively identify carried318i/318is four-cylinder,524td diesel and750iL/850Ci/850CSi/850i V12 applications beyond the short L6 heading. Those original year bounds remain engine/housing qualifications, not manufacturer certification of all four-cylinder, diesel or V12 vehicles. Verify chassis, engine, original element and actual vehicle element count. In particular, one element supplied does not establish a complete multi-airbox service set. Later325i/525i bounds have varying retailer endpoints and remain qualified rather than silently narrowed from a shorter table. A separately named1993 525iT retailer row remains pending precise model taxonomy and housing review; no new model mapping is inferred.
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.
- No numerical airflow-gain, horsepower or efficiency test is supplied on the current exact primary. General airflow wording is not a demonstrated percentage or an engine-output guarantee for this exact configuration.
Fitment
| Detail | Value |
|---|---|
| Current primary family | Specified E30/E28/E34 inline-six M20/M50/M30 original housings |
| Media | THREE non-oiled synthetic layers per dedicated primary section |
| Primary wording conflict | Cotton-gauze overview versus dedicated synthetic Pro DRY S; do not oil |
| Carried broader engines | Four-cylinder,524td diesel and V12 original scopes retained with exact-part retailer qualifications |
| Package quantity | ONE element; verify actual vehicle element count separately |
31-10047: 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 | 31-10047 |
| 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 | No numerical airflow-gain, horsepower or efficiency test is supplied on the current exact primary. General airflow wording is not a demonstrated percentage or an engine-output guarantee for this exact configuration. |
| 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 31-10047?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 current exact manufacturer identifies BMW325i/e/es/ix E30 and520i/525i/525e/528e/530i/535i E28/E341986–1994 L6 M20/M50/M30 applications. Its dedicated Pro DRY S section specifies THREE progressive non-oiled synthetic layers; the overview instead says cotton gauze, a wording conflict that does not authorize oiled-filter servicing. Exact dry-part retailers also positively identify carried318i/318is four-cylinder,524td diesel and750iL/850Ci/850CSi/850i V12 applications beyond the short L6 heading. Those original year bounds remain engine/housing qualifications, not manufacturer certification of all four-cylinder, diesel or V12 vehicles. Verify chassis, engine, original element and actual vehicle element count. In particular, one element supplied does not establish a complete multi-airbox service set. Later325i/525i bounds have varying retailer endpoints and remain qualified rather than silently narrowed from a shorter table. A separately named1993 525iT retailer row remains pending precise model taxonomy and housing review; no new model mapping is inferred.
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?No numerical airflow-gain, horsepower or efficiency test is supplied on the current exact primary. General airflow wording is not a demonstrated percentage or an engine-output guarantee for this exact configuration.
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 one element complete a V12 vehicle service?Not automatically. One element is supplied; verify the actual engine and airbox count for the bounded application. Broader exact-part retailer V12 entries do not approve every V12 housing or establish a packaged pair.
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 31-10047 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.
31-10047: 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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