Wix WS10021 Diesel Exhaust Fluid (DEF) Urea Filter

Wix WS10021 DEF Urea Filter Overview

The Wix WS10021 is a diesel exhaust fluid (DEF) urea filter built for heavy-duty emission control service. It uses synthetic media in a diesel exhaust cartridge style to help maintain cleaner DEF flow and support consistent aftertreatment system performance on compatible diesel applications.

For fleet maintenance, commercial trucks, and diesel equipment, the WS10021 helps keep the DEF system closer to clean operating condition over time. It is a practical replacement choice when servicing emission control filtration on Mercedes-Benz Sprinter and Freightliner diesel applications that use this filter style.

Key Features

• Diesel exhaust fluid (DEF) urea filter for emission control service
• Synthetic media material for filtration support in heavy-duty use
• Diesel exhaust cartridge style construction
• Heavy-duty duty type for commercial diesel applications
• Closed top with 2.95 in. outer diameter and 4.08 in. height
• Wix part number WS10021 for direct catalog lookup

Detailed Product Description

The Wix WS10021 is engineered as a DEF urea filter for diesel exhaust systems where filtration quality matters to aftertreatment reliability. Filtration is a core part of maintenance because it helps equipment stay closer to new condition for longer, and this cartridge-style filter is built around that service need. The synthetic media supports filtration in demanding diesel environments, while the compact cartridge dimensions make it suitable for specific OE-style DEF filter housings.

This part cross-references Nissens 94179 for the same application. If you are searching for a Mercedes-Benz Sprinter DEF filter or a Freightliner diesel exhaust fluid filter, WS10021 is a relevant catalog match to verify against your existing part number and housing design.

What It Helps Address

• DEF contamination entering the aftertreatment system
• Restricted fluid flow caused by a dirty urea filter
• Service issues tied to neglected emission control filtration
• Maintenance intervals where the DEF filter needs replacement
• Cleaner operation in heavy-duty diesel exhaust fluid systems

Installation Notes and Tips

Confirm the housing style, dimensions, and OE part number before installation. Match the closed-top cartridge design, outer diameter, and height to the existing filter specification. For Mercedes-Benz Sprinter and Freightliner diesel applications, verify the DEF filter location and service procedure in the vehicle service information before replacing the part.

Use clean handling practices during installation so the DEF system stays free of debris and contamination. Replace the filter during scheduled emission system maintenance or whenever inspection shows restriction or contamination.

Quality Assurance

Wix positions filtration as a maintenance foundation, and its supplemental filtration items are intended to support installation, service life, and maintenance data needs. The WS10021 follows that filtration-focused approach for diesel exhaust fluid service in heavy-duty applications.

Compatible With Mercedes-Benz Sprinter and Freightliner diesel applications that use the WS10021-style DEF urea filter.