Product Description
CUMMINS 3973511 OEM ENGINE OIL FILL CAP FOR 1998.5-2024 5.9L AND 6.7L CUMMINS
The genuine CUMMINS 3973511 OEM engine oil fill cap is the factory replacement oil cap for many 1998.5-2024 5.9L and 6.7L Cummins ISB engines.
This OEM Cummins oil fill cap helps restore proper crankcase sealing and helps prevent oil seepage, contamination, and crankcase vapor leaks caused by worn or damaged oil caps.
Designed and tested by Cummins, this replacement cap delivers proper fitment, secure engagement, and dependable durability for Ram truck and industrial Cummins applications.
FEATURES
- Genuine OEM Cummins oil fill cap
- Direct-fit replacement for many 5.9L and 6.7L Cummins engines
- Helps prevent oil seepage and contamination
- Restores proper crankcase sealing
- Designed for heat resistance and long-term durability
- Quick and simple installation
FITMENT
- 1998.5-2007 Dodge Ram 2500 and 3500 5.9L Cummins ISB
- 2007.5-2024 Ram 2500 and 3500 6.7L Cummins ISB
- Select industrial and commercial Cummins ISB applications
- Installs on the valve cover oil fill opening
Fitment Note: Always verify compatibility using VIN or ESN before ordering.
WHAT'S INCLUDED
- 1 Cummins 3973511 OEM engine oil fill cap
CROSS-REFERENCE
- Cummins 3915705
- Cummins 3949888
COMPANION PARTS
- Cummins valve cover gasket
- Cummins crankcase breather element
- Cummins valve cover seals and hardware
SPECIFICATIONS
- Brand: Cummins
- Part Number: 3973511
- Product Type: Engine oil fill cap
- Engine Compatibility: 5.9L and 6.7L Cummins ISB
- Fitment Years: 1998.5-2024
- Position: Valve cover oil fill opening
- Shipping Weight: Approximately 0.25 pound
- Shipping Method: Standard ground shipping
- Condition: New genuine Cummins OEM part
FAQ
Will this fit both 5.9L and 6.7L Cummins engines?
Yes. Cummins 3973511 is used on many 5.9L and 6.7L Cummins ISB applications from 1998.5-2024.
Is this a complete oil fill cap assembly?
Yes. This listing includes the complete OEM engine oil fill cap assembly.
What happens if my original cap will not tighten?
A worn oil cap may allow oil vapor leaks or improper sealing. Replacing it with a genuine Cummins cap restores proper sealing and fitment.
Will this fix engine blow-by or oil consumption?
No. This cap only seals the oil fill opening. Excessive blow-by or oil consumption should be diagnosed separately.
Why use a genuine Cummins oil cap instead of aftermarket?
Genuine Cummins oil caps are designed for proper sealing tension, heat resistance, and long-term durability.
