The AEM Induction 28-20031 is a red, panel-style DryFlow replacement air filter measuring 11 in x 6.688 in x 1.438 in, built on an oil-free synthetic element. The manufacturer's DryFlow install documentation states that no filter oil is required, which matters to owners on user forums who worry about oil migrating onto a mass airflow sensor in a stock airbox. Compared with an oiled cotton gauze or cheaper generic panel, this element can be cleaned and reinstalled instead of replaced. Owners on user forums describe cleaning theirs periodically with a shop vac and a full wash each year, and one owner estimated that the savings over disposable filters take roughly 100,000 miles to add up.
Fitment is the main thing to verify before ordering. Application lists for this filter span multiple Nissan and Infiniti platforms, including 240SX, Altima, Maxima, Murano, Xterra, and 350Z entries, but the year and engine ranges vary between sources, so confirm your exact model, engine, and airbox with the manufacturer. Panel filters are not always interchangeable: a user on a forum reported that a different AEM DryFlow panel filter needed airbox lid modifications and left little airflow clearance. Installation is typically a drop-in swap with the airbox open, and owners on forums recommend checking lid and clamp clearance against the new element's thickness before closing everything up. Keep the dry element inside a stock or enclosed airbox rather than an exposed intake, since forum users advise against exposing dry media to the elements. Long-tail searches for this part usually include terms like AEM 28-20031 oil-free panel filter, Nissan DryFlow replacement air filter, and washable dry panel air filter Nissan.
No. The manufacturer's DryFlow installation sheets state that the filters require no oil, and owners on user forums confirm that dry-style elements do not need oiling.
Not guaranteed. Owners on user forums report that a different AEM DryFlow panel filter (28-20304) on a 2015 WRX needed airbox lid modifications and left limited clearance. Check your airbox clearance and confirm fitment with the manufacturer before installing.
The manufacturer's install sheet for a DryFlow filter kit recommends servicing the filter every 20,000 miles for optimum performance.
This is a beginner-friendly swap that typically requires only basic hand tools to open the airbox and loosen its clamps. Before reassembly, compare the new element's thickness against the stock filter and confirm the airbox lid closes without pinching or crowding the element. Owners on user forums who changed filters on Nissans noted that the engine computer may need several days of driving to relearn after a filter change. The manufacturer also sells a DryFlow cleaning kit (part 21-110) for periodic maintenance.
