Product Description
CUMMINS 3864458 OEM ENGINE OIL COOLER GASKET (COOLER TO FILTER HEAD) – RAM 5.9L (2003–2007)
The genuine CUMMINS 3864458 engine oil cooler gasket provides a critical seal between the oil cooler housing and the filter head on all 2003–2007 5.9L Cummins engines. When this gasket ages, hardens, or compresses unevenly, it commonly leads to oil leaks, reduced oil pressure, and contamination risk. Installing a true OEM Cummins gasket ensures maximum durability, proper sealing pressure, and long service life.
This gasket is engineered to withstand high heat, vibration, and full-system oil pressure, making it far superior to generic aftermarket alternatives. Whether you are servicing an oil cooler, repairing an oil leak, or overhauling a high-mileage 5.9L, this is the exact factory part designed to maintain OE reliability.
Key Features
- Genuine Cummins OEM gasket for the best sealing performance.
- Designed for 2003–2007 5.9L Cummins oil cooler assemblies.
- Prevents oil leaks at the cooler-to-filter head connection.
- Heat- and pressure-resistant for long-term durability.
- Direct-fit replacement with no modifications required.
Fitment Details
- Engine: 5.9L Cummins ISB / High-Output (2003–2007)
- Vehicles: 2003–2007 Dodge Ram 2500 & 3500 with 5.9L Cummins
- Location: Seals the engine oil cooler to the oil filter head
Always confirm fitment using your engine serial number (ESN).
Cross-Reference & Compatible Cummins Parts
CPP Diesel stocks all common Cummins components used during oil cooler service. Pair this gasket with these genuine Cummins parts:
- CUMMINS 3958645 ENGINE OIL COOLER CORE – 5.9L CUMMINS
- CUMMINS 3935942 OIL COOLER GASKET (COOLER COVER)
- CUMMINS 4934847 OIL FILTER HEAD GASKET – 5.9 / 6.7 CUMMINS
Cross-reference numbers: 3864458, 4955850 (supersession reference)
Installation Notes
- Always clean the mating surfaces thoroughly before installation.
- Inspect the oil cooler and filter head for warping or debris.
- Do not use RTV unless specified by Cummins for your ESN.
- Torque fasteners to Cummins specifications only.
Specifications for cummins 3864458
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3864458 |
| Cross Reference | 4955850 (Cummins supersession reference) |
| UPC | 607611435678 |
| GTIN | 00607611435678 |
| Engine Compatibility | 2003–2007 5.9L Cummins ISB |
| Function | Oil cooler to oil filter head sealing gasket |
| Shipping Weight | Approx. 0.1 lb |
| Shipping Method | Standard ground; expedited options available |
| E-Codes | N/A (gasket-only component) |
| Prop 65 Warning | WARNING: This product may expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by production batch) |
Frequently Asked Questions
WILL THIS FIT ALL 2003–2007 5.9L CUMMINS ENGINES?
Yes—CUMMINS 3864458 is used on all 2003–2007 5.9L Cummins ISB engines. We still recommend confirming with your ESN.
SHOULD I REPLACE OTHER GASKETS WHILE DOING AN OIL COOLER SERVICE?
Yes. Consider replacing the CUMMINS 3935942 cooler cover gasket and CUMMINS 4934847 filter head gasket for a complete, leak-free job.
IS THIS AN OEM CUMMINS GASKET?
Yes. CPP Diesel supplies only genuine Cummins gaskets for critical sealing applications.
DOES THIS GASKET REQUIRE RTV OR SEALANT?
No. This gasket is designed to seal dry. Use sealant only if instructed by Cummins for your specific ESN.
