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K&N SO-4003 spin-on oil filter delivers high flow rates to reduce oil restriction and support engine performance in Ram 2500/3500 trucks with 6.7L Cummins diesel engines from 2011-2024, plus select 1989-2010 Dodge Ram models. Engineered with premium pleated media, it traps contaminants while handling synthetic, conventional, or blended oils for reliable protection. The fluted canister allows easy removal using standard oil filter wrenches favored by professionals.
Key Features
- High Flow Design: Reduces oil restriction to maintain consistent pressure and lubrication during high-demand operation.
- Anti-Drainback and Bypass Valves: Prevents dry starts and ensures flow during cold conditions or high loads.
- Fluted Canister: Shaped for secure grip with common oil filter wrenches, simplifying service on commercial fleets.
- Ships in protective individual box, 3.688 x 3.688 x 6.125 inches.
- Compatible with 1"-12 thread size. torque to 18-22 ft-lbs.
- Cellulose media blend with synthetic resin impregnation for durability and high capacity.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 1989-1993 | Dodge | D250 | Verify engine and application notes |
| 1989-1993 | Dodge | D350 | Verify engine and application notes |
| 1994-2010 | Dodge | Ram 2500 | Laramie, SLT, Sport, ST, TRX, TRX4 |
| 1994-2010 | Dodge | Ram 3500 | Laramie, SLT, Sport, ST, SXT |
| 1989-1993 | Dodge | W250 | Verify engine and application notes |
| 1989-1993 | Dodge | W350 | Verify engine and application notes |
| 2011-2024 | Ram | 2500 | Big Horn, Laramie, Laramie Limited, Laramie Longhorn, Limited, Limited Longhorn, Lone Star, Outdoorsman, additional manufacturer-listed applications |
| 2011-2024 | Ram | 3500 | Big Horn, Laramie, Laramie Longhorn, Limited, Limited Longhorn, Lone Star, SLT, Special Service, additional manufacturer-listed applications |
Specifications
| Brand | K&N Engineering |
|---|---|
| Manufacturer Part Number | SO-4003 |
| Product Type | Oil Filters |
| Fitment Type | Vehicle Specific |
| Condition | New |
What's Included
One new K&N oil filters identified by manufacturer part number SO-4003. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.
About K&N Engineering
K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.
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Frequently Asked Questions
How do I confirm K&N SO-4003 fits my vehicle?
Match the year, make, and model in the fitment table, then confirm the engine, factory housing, sensor layout, emissions notes, and any application restrictions stated for this exact part.
Can K&N SO-4003 be used with synthetic oil?
Use the oil types and service interval approved by the vehicle manufacturer. Confirm thread, gasket, bypass-valve, and anti-drainback specifications before installation.
What should be checked after installing K&N SO-4003?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.
Installation Instructions
- Lubricate gasket with clean oil before threading onto engine mount
- Compatible with 1"-12 thread size. torque to 18-22 ft-lbs
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