Product Overview
Volvo Mack 21756508 21212414 Diesel Oxidation Catalyst DOC
Interchange References: Volvo/Mack 21756508 and 21212414, Skyline VN0608, FSS Emission Products VN0608-FSS, Global Emission Systems GESi-555, DuraFit C20-0166, Dinex 82023
Replace a worn or damaged Volvo/Mack 21756508 or 21212414 Diesel Oxidation Catalyst DOC with this brand-new Skyline aftermarket DOC filter. This direct-fit replacement is intended for select Volvo D13 and D16 and Mack MP8 and MP10 heavy-duty diesel engine applications using compatible EPA10 exhaust aftertreatment systems, including select highway, regional-fleet, heavy-haul, and vocational configurations. This DOC has no core charge, includes a 3-year unlimited mileage warranty, is EPA compliant, and ships free within the continental United States.
Volvo Mack DOC Cross Reference Table
Volvo and Mack 21756508 and 21212414 DOC filters cross-reference with Skyline VN0608 and the additional aftermarket replacement numbers listed below.
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Volvo/Mack OEM | 21756508, 21212414 |
| Skyline | VN0608 |
| FSS Emission Products | VN0608-FSS |
| Global Emission Systems | GESi-555 |
| DuraFit | C20-0166 |
| Dinex | 82023 |
| FSS Emission Poducts | VN0608-FSS |
Volvo D13 D16 Mack MP8 MP10 DOC Fitment Guide
This Skyline DOC filter is intended for select heavy-duty diesel applications equipped with compatible Volvo D13 or D16 and Mack MP8 or MP10 EPA10 exhaust aftertreatment systems. Exact compatibility varies by engine calibration, emissions family, model year, chassis configuration, exhaust layout, and the original stamped DOC part number.
- Engine Platforms: Select Volvo D13 and D16 and Mack MP8 and MP10 heavy-duty diesel engines
- Approximate Model Years: Select 2010–2012 applications
- Approximate Emissions Era: EPA10 exhaust aftertreatment applications
- Common Chassis Applications: Select highway, regional-fleet, heavy-haul, and vocational configurations
- Compatible OEM Numbers: 21756508 and 21212414
Choose Your Kit Configuration
Select the configuration from the product options that best fits your installation needs.
- Full Kit (Best Value): Includes one (1) brand-new DOC unit, one (1) 21212522 installation gasket, one (1) 21095726 installation gasket, one (1) 21212520 heavy-duty clamp, and one (1) 21021850 heavy-duty clamp
- DOC Only: Includes one (1) DOC only. Installation gaskets and clamps are not included
DOC Technical Specifications
| Measurement Parameter | Specification Value |
|---|---|
| Product Type | Diesel Oxidation Catalyst DOC inlet module |
| Common Search Terms | DOC, DOC Filter, Diesel Oxidation Catalyst |
| Engine Compatibility | Select Volvo D13 and D16 and Mack MP8 and MP10 applications |
| Material | Stainless steel |
| Weight | 51.89 lb (23.54 kg) |
| Overall Length | 15.14 in (385.00 mm) |
| Outer Body Diameter | 19.79 in (503.00 mm) |
| Dimensions | 19.79 × 17.71 in (503.00 × 450.00 mm) |
| Core Condition | Brand-new aftermarket unit |
| Core Charge | No core charge |
| Warranty | 3-year unlimited mileage warranty |
| Exhaust Emission Norm | EPA10 compliant |
Key Features
- Direct-fit replacement for the listed Volvo and Mack OEM applications
- Brand-new Skyline aftermarket Diesel Oxidation Catalyst DOC
- No core charge or used catalyst return required
- Stainless steel construction
- EPA compliant for applicable federal emissions applications outside California
- Available Full Kit with 21212522 and 21095726 gaskets and 21212520 and 21021850 clamps
- Ships free within the continental United States
- Backed by a 3-year unlimited mileage warranty
Signs Your DOC Needs Replacement
- Difficulty reaching or maintaining exhaust temperatures needed for DPF regeneration
- Frequent, incomplete, or unsuccessful regeneration cycles
- Diagnostic trouble codes related to DOC catalyst efficiency or exhaust temperature response
- Excessive soot loading in the downstream DPF
- Fuel, oil, or other contamination visible at the catalyst inlet
- Increased exhaust backpressure or reduced engine performance
- Cracking, melting, corrosion, or other physical damage to the catalyst substrate or housing
Multi-Warehouse Dispatch
Orders ship from regional fulfillment hubs to help provide fast delivery to your repair shop or location.
*Note: Always verify exact compatibility using your vehicle's VIN number or original stamped OEM part number on the unit before placing an order.
Disclaimer: Product images are for reference only. Each selected option includes one (1) physical DOC unit. The Full Kit option includes one DOC with the listed gaskets and clamps. The DOC Only option includes one DOC only, with no installation gaskets or clamps included.
