Product Description
The CUMMINS 3973512 OEM ENGINE OIL CAP O-RING is a genuine Cummins replacement sealing ring designed for 1998.5-2025 Dodge Ram and Ram 5.9L/6.7L Cummins diesel engines. This OEM o-ring seals the engine oil fill cap to help prevent oil leaks, dirt intrusion, and crankcase contamination.
Over time, factory oil cap seals can harden, flatten, crack, or shrink due to heat exposure and engine vibration. Replacing the oil cap o-ring helps restore proper sealing performance and maintain a clean engine bay while preventing oil seepage around the fill cap.
The Cummins 3973512 o-ring is manufactured to genuine OEM specifications for proper fitment, sealing performance, and long-term durability.
FEATURES
- Genuine Cummins OEM replacement part
- Fits 1998.5-2025 5.9L and 6.7L Cummins diesel engines
- Seals engine oil fill cap assembly
- Helps prevent oil leaks and seepage
- Protects against dirt and contaminant intrusion
- OEM-quality fitment and material construction
- Ideal for maintenance and engine resealing
- Direct-fit replacement design
FITMENT
- 1998.5-2002 Dodge Ram 2500/3500 5.9L Cummins 24V
- 2003-2007 Dodge Ram 2500/3500 5.9L Cummins Common Rail
- 2007.5-2025 Ram 2500/3500 6.7L Cummins
- 2008-2025 Ram 4500/5500 6.7L Cummins
WHAT'S INCLUDED
- 1 Cummins 3973512 OEM oil cap o-ring
CROSS-REFERENCE & RELATED PRODUCTS
- CUMMINS 4932124 OEM OIL COOLER CORE GASKET
- MAHLE VS50452 VALVE COVER GASKET SET
- CUMMINS 4995602 OEM ROCKER LEVER ASSEMBLY
- CUMMINS OEM ENGINE PARTS
WHY REPLACE THE OIL CAP O-RING?
A worn or damaged oil cap seal can allow oil seepage around the fill cap while also allowing dirt and contaminants into the crankcase. Replacing the o-ring during routine maintenance helps maintain proper sealing and keeps the engine compartment cleaner and more reliable.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | Cummins |
| Part Number | 3973512 |
| Component Type | Engine oil cap o-ring |
| Engine Compatibility | 5.9L Cummins 24V / 6.7L Cummins |
| Fitment Years | 1998.5-2025 |
| Material | OEM rubber sealing compound |
| Application | Oil fill cap sealing |
| Condition | New Genuine Cummins OEM Part |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
What does the Cummins 3973512 o-ring seal?
This o-ring seals the engine oil fill cap to help prevent oil leaks and contamination from entering the crankcase.
Will this fit both 5.9L and 6.7L Cummins engines?
Yes. Cummins 3973512 fits many 1998.5-2025 5.9L and 6.7L Cummins diesel applications.
What are the signs of a bad oil cap o-ring?
Common symptoms include oil seepage around the oil cap, a loose-feeling cap, visible cracking, flattening, or hardened rubber sealing material.
Is this a genuine Cummins OEM part?
Yes. Cummins 3973512 is a genuine OEM replacement oil cap o-ring manufactured to factory specifications.
