Product Description
Interstate-McBee M-3921558 Oil Cooler – 1989–2002 5.9L Cummins (12V/24V)
Restore proper oil temperature control on your 5.9L Cummins (1989–2002) with this OEM-style 7-plate oil cooler core from Interstate-McBee. It’s a direct-fit aftermarket replacement engineered for the B-Series/ISB and built for durability and consistent heat transfer.
- Direct-fit replacement: Matches OEM form, fit, and function for 5.9L Cummins 12V & 24V.
- 7-plate core design: Efficient heat rejection to protect bearings and extend oil life.
- Aftermarket value: Interstate-McBee quality at significant savings versus OEM.
- Shop support: ESN verification and tech help available from CPP Diesel.
Specifications
| Part Number | M-3921558 (Interstate-McBee) |
|---|---|
| OEM Cross-References | 3921558; commonly cross-referenced with 3957544 and others (see notes) |
| Core Type | 7-plate oil cooler core |
| Engine | Cummins 5.9L B-Series / ISB (12-Valve & 24-Valve) |
| Years | 1989–2002 (Dodge Ram 2500/3500) |
| What’s Included | Oil cooler core only (gaskets sold separately) |
Recommended Related Parts
- Gasket, cooler to block: M-4932124
- Gasket, cooler to filter housing: 3942915
Vehicle Fitment
Always verify by Engine Serial Number (ESN) for exact compatibility.
- Dodge Ram 2500/3500 5.9L Cummins
- 1989–1998 12-Valve 6BT
- 1998.5–2002 24-Valve ISB
Install Notes
- Drain and capture coolant/oil safely; cap lines to prevent contamination.
- Thoroughly flush the oil system if a cooler failed due to debris/overheat.
- Use new gaskets; follow the Cummins service manual for torque values and sequences.
- Prime the lubrication system and verify oil pressure on first start.
Warranty
Interstate-McBee new parts include manufacturer warranty coverage. Terms vary by component; contact us for coverage details on oil coolers.
FAQ
Will this fit both 12V and 24V 5.9L engines?Yes. It’s listed for 1989–2002 5.9L Cummins, covering both 12-valve (’89–’98) and 24-valve ISB (’98.5–’02) applications. Verify by ESN for edge cases.
Are gaskets included with the cooler?
No—order gaskets separately. We recommend M-4932124 (cooler-to-block) and 3942915 (cooler-to-filter housing).
What is the core type/plate count?
This Interstate-McBee cooler uses a 7-plate core design for efficient heat transfer.
Does this replace Cummins 3957544?
It is commonly cross-referenced with 3957544 in the aftermarket. Always confirm by ESN/application before substituting.
Product Videos
Custom Field
YEAR 1989-2002
MAKE DODGE
ENGINE 5.9L
