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INTERSTATE MCBEE

INTERSTATE-MCBEE M-3921558 OIL COOLER 89-02 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

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SKU:
MCBM-3921558
MPN:
M-3921558
Shipping:
Calculated at Checkout
$129.87
724-785-4022

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.
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Additional Information

YEAR:
1989-2002
MAKE:
DODGE
ENGINE:
5.9L
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