Product Overview
Aftermarket DOC Replacement for Volvo / Mack 21756508 / 21212414 DOC Filter
Interchangeable Component Configurations: 21756508 | 21212414 | VN0608
Restore commercial fleet emissions performance with this premium Skyline aftermarket Volvo / Mack 21756508 / 21212414 DOC Inlet Module Replacement Kit. This brand-new flow-through Diesel Oxidation Catalyst (DOC) functions as an absolute match for factory-stamped numbers 21756508 and 21212414. Engineered as a genuine OE manufactured component replacement for heavy-duty EPA10 emissions modules running Volvo D13 / D16 and Mack MP8 / MP10 powertrain platforms, it requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.
Cross-References for Volvo / Mack 21756508
Instant Fitment Verification: This direct-fit replacement diesel oxidation catalyst replaces components stamped with housing part numbers, casting codes, master assembly codes, or tag profiles matching any of the interchangeable manufacturing references listed below:
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Volvo / Mack OEM Cross References | 21756508, 21212414 |
| Skyline | VN0608 |
| Roadwarrior | GESI-555 |
| DuraFit | C20-0166 |
| Dinex | 82023 |
| FSS Emission Product | VN0608-FSS |
Choose the Setup That Fits Your Shop’s Needs
Select the setup from the product options above that best fits your shop's needs:
- Full Kit (Best Value): Includes (1) Brand-New Particulate Filter, (2) OEM-quality gaskets (21212522, 21095726), and (2) heavy-duty hardware clamps (21212520, 21021850).
- DOC Only: Includes the replacement catalyst module core only. Service gaskets and mounting clamps are not included.
TECHNICAL SPECIFICATIONS
| Measurement Parameter | Specification Value |
|---|---|
| Material Base Construction | Stainless Steel |
| Net Assembly Weight | 51.89 lbs (23.54 kg) |
| Overall Length | 15.14 inches (385.00 mm) |
| Outer Body Diameter | 19.79 inches (503.00 mm) |
| Component Dimensions (W x H) | 19.79 x 17.71 inches (503.00 x 450.00 mm) |
| Exhaust Emissions Norm | EPA10 Compliant |
Key Features
- Proudly Built in the USA: Designed, engineered, and manufactured in America.
- EPA Compliant: Meets federal EPA10 emission standards for legal installation nationwide.
- No Core Charge: Brand-new unit; completely eliminates dirty core return tracking and balance hassles.
- Exact-Fit™ Technical Dimensions: Built with matching inlet/outlet outer diameters, pre-machined sensor ports, and specialized body hanger brackets for zero exhaust system modifications.
- Substrate Performance Matrix: Advanced flow-through catalyst core uses verified washcoat metal loading to sustain exhaust temperature control and lower backpressure limits.
- Premium Stainless Steel Construction: High-grade stainless steel shell maximizes thermal durability, preventing oxidation under heavy fleet use.
- Fast Free Shipping: Free ground freight within the continental United States. Orders confirmed before 2:00 PM Eastern can ship out the same business day.
- Warranty Protection: Supported by an extensive 3-year unlimited mileage replacement coverage matrix.
Engine Compatibility & Fitment Guide
Direct alternative replacement solution for supported model year commercial configurations running horizontal chassis architectures. Optimized for:
- Engine Platforms: Highly optimized for heavy-duty Volvo / Mack D13 / MP8 and D16 / MP10 powertrain platforms matching approximate model years 2010 to 2012.
- Chassis Fitments: Extensively deployed across commercial highway applications, heavy haul trucks, and regional fleet operations matching engine configurations.
Frequently Asked Questions
Does this replacement DOC require a core return?
No. This is a brand-new aftermarket unit. There are no core charges, core tracking hassles, or return freight expenses required.
Does this replacement unit come with the necessary clamps and gaskets?
It depends on your selection. Selecting the "Full Kit" configuration adds the listed service gaskets and hardware clamps to your shipment package. Opting for the "DOC Only" selection provides the replacement core unit alone without service mounting hardware accessories.
Will this unit clear active dashboard emissions fault codes?
Yes, assuming downstream diesel particulate filters and exhaust sensors are operating within specification. Replacing a degraded catalyst restores legal conversion thresholds, allowing the vehicle control module to clear active DOC efficiency faults.
SIGNS YOUR DIESEL OXIDATION CATALYST (DOC) NEEDS REPLACEMENT
- Frequent, unprompted, or incomplete DPF regeneration cycles linked directly to upstream catalyst efficiency degradation matching part numbers 21756508 / 21212414
- Excessive particulate soot face-plugging or heavy face mask scaling across the internal catalyst face assembly
- Active dashboard diagnostic trouble codes (DTCs) pointing directly to poor catalyst conversion efficiencies or thermal response delays
- Unexplained commercial engine backpressure spikes or noticeable horsepower deterioration under loaded transport pulls
*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped OEM part number on your catalyst module casing before placing an order.
Disclaimer: Product images are for reference only. Service installation hardware depends on configuration parameters selected during product checkout lines. Selecting the "Full Kit" option adds the explicitly listed high-temperature gaskets and hardware clamps to your tracking shipment. Price is for (1) pre-packaged DOC component setup. Inventory levels are subject to local availability updates.
