DVPARTS 4" Blue Oiled Cold-Air Intake Filter — 4" ID Reusable Washable Replacement (Pre-Oiled)

High-flow 4-inch blue oiled intake filter by DVPARTS is a washable, reusable replacement designed to fit Rudy's and other 4" ID cold-air intakes for many Ford Super Duty Powerstroke diesels (1999–2021).

This DVPARTS replacement filter (DP0235 and compatible part numbers) offers a straightforward way to restore airflow and filtration for 4" cold-air systems. It arrives pre-oiled and ready to install, and it’s designed specifically for applications that require a 4" inlet diameter. The construction emphasizes repeatable cleaning and reuse so you can keep your intake performing without frequent replacements.

Will this filter fit my 4" Rudy's cold-air intake?

Yes — the filter is manufactured to the 4" inside-diameter specification used by Rudy's cold-air intakes, and it also suits many other intakes that accept a 4" ID element. Confirm the inlet diameter on your intake before ordering to ensure a correct seal and fitment.

• Fits Rudy's 4" intakes and other systems accepting 4" ID filters
• Compatible mounting profile for direct swap installations
• Pre-oiled for immediate use after fitting

How should I clean and maintain this reusable oiled filter?

Cleaning is simple: remove the filter, use a filter-specific cleaner to remove dirt and old oil, rinse thoroughly with low-pressure water, let it dry completely, then reapply filter oil evenly. Routine cleaning intervals depend on driving conditions; inspect the filter visually after heavy off-road or dusty use.

• Use dedicated air-filter cleaner and low-pressure water rinse
• Allow full air-dry before re-oiling to prevent trapping contaminants
• Reapply thin, even oil layer for consistent filtration performance

Which vehicles and engines is this filter compatible with?

This DVPARTS filter is specified for many Ford Super Duty trucks equipped with Powerstroke diesel engines from 1999 through 2021. It covers F-250, F-350, F-450 and F-550 model families when the vehicle uses a qualifying 4" intake system.

• Compatible with Ford F-250/F-350/F-450/F-550 Powerstroke diesels
• Fits 7.3L, 6.0L, 6.4L, 6.7L and 6.6L engines where a 4" intake is used
• Replacement for part numbers DP0235, DP0091, DP0173, and related codes

What are the practical benefits of choosing this DVPARTS replacement?

Opting for a washable, reusable oiled filter lowers long-term upkeep costs while preserving airflow essential to cold-air systems. The pre-oiled element simplifies initial installation, and the durable media is intended for multiple cleaning cycles without losing fitment or function.

• Reusable design cuts replacement frequency and expense
• Pre-oiled for quick installation and immediate protection
• 4" inlet diameter maintains designed airflow for cold-air setups

Who is this for: The DVPARTS 4" blue oiled replacement filter is aimed at truck owners and mechanics who run Rudy's or any compatible 4" cold-air intake on Ford Super Duty Powerstroke diesels and want a durable, serviceable filter solution. It's a practical pick for drivers who prefer maintaining factory-fit airflow while reducing recurring filter purchases, and for shops servicing 1999–2021 Powerstroke-equipped trucks that use a 4" intake element.