The K&N E-0785 is an oval, drop-in High-Flow replacement air filter for the 6.4L V8 turbo diesel in 2008-2010 Ford F-250 Super Duty trucks. Its layered, oiled cotton gauze media is designed to improve airflow while capturing contaminants, and the manufacturer rates it at up to 99% efficiency. It replaces the factory paper element, so the factory air box stays in place.
The main reason to choose it over stock is that it is reusable. The manufacturer says it is engineered to last the vehicle's lifespan and is backed by a No-Hassle Lifetime Limited Warranty, so you clean and re-oil it instead of buying a new element at every service. The manufacturer says the design is meant to add horsepower, but it does not publish a figure for this application, so buyers should expect better airflow rather than a guaranteed gain. This is a good fit for owners searching for a 6.4 Powerstroke intake upgrade, a washable diesel truck air filter, or a 2008-2010 F-250 reusable cotton gauze filter.
The manufacturer states this filter is a direct replacement for the stock air filter and that no modifications are required. The procedure still has to be followed exactly so the filter seals properly.
The manufacturer describes this filter as washable and reusable. Its listed re-oiling amount is 10.27 oz (304 ml). Confirm the cleaning and oiling steps with the manufacturer's care documentation before servicing.
This is a straightforward drop-in job that takes only a few minutes. Per the manufacturer's install sheet, unfasten the air box clamps, remove the air box lid, and take out the stock filter. Wipe out any dirt or dust in the housing, then set the K&N in the air box with one ear locking behind the step in the base and press it into place. Reinstall the lid so its step sits behind the other ear, then refasten the clamps. The install sheet warns that these steps must be repeated every time the filter is serviced, or the filter may not seal and engine damage could result.
