CUMMINS
CUMMINS 3973512 OEM ENGINE OIL CAP O-RING – RAM 5.9L/6.7L (1998.5–2025)
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- SKU:
- CUM3973512
- MPN:
- 3973512
- Shipping:
- Calculated at Checkout
Description
Genuine Cummins
Cummins 3973512 — Engine Oil Cap O-Ring (Fill Cap Seal)
MPN: 3973512 | Also Known As: oil cap O-ring, oil fill cap seal, O-ring seal
Why This Part
- ✓ OE sealing to stop oil mist/leaks at the fill cap.
- ✓ Direct-fit for Ram Cummins 5.9L & 6.7L (see fitment).
- ✓ Durable elastomer formulated for heat and oil exposure.
- ✓ Low-cost fix that protects the valve cover area from mess.
OE Fit Stock Replacement 1 Per Cap
Quick Specs
| Type | Engine oil fill cap O-ring / seal |
|---|---|
| OE Part # | 3973512 |
| Location | Seals the engine oil fill cap to the valve cover |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB (24V VP44) | Ram 2500/3500 |
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2025 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: Simple cap-seal O-ring used across multiple ISB generations; always verify by VIN/ESN if components have been changed.
Often Paired With
- Oil Fill Cap (popular pairings): 3973511 (1998.5–2002) · 4962608 (1994–1998)
- Valve cover grommet/seal if damaged or hardened
- Degreaser & rags to clean any oil residue on cover
What’s In The Box
- (1) Genuine Cummins Oil Cap O-Ring (3973512)
Install Tips
- Lightly oil the new O-ring; seat evenly on the cap.
- Inspect the cap and valve cover sealing face for nicks or debris.
- After install, run engine and verify no misting/leaks at the cap.
FAQ
WILL THIS FIT MY 5.9L OR 6.7L CUMMINS RAM?Yes—this O-ring fits most 1998.5–2025 Ram 2500/3500 5.9L & 6.7L applications (verify by VIN/ESN).
WHAT SYMPTOMS POINT TO A BAD OIL CAP O-RING?Oil mist or drips around the cap/valve cover, or the cap feeling loose. Replacing the O-ring usually fixes it.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3973512 O-ring seal for the engine oil fill cap.
DO I NEED ANY SEALANT?No—install dry or with a light film of clean oil. No RTV/sealant is required.
WHAT OIL FILL CAPS MATCH THIS O-RING?Common pairings include 3973511 (’98.5–’02) and 4962608 (’94–’98). For other years, confirm by VIN/ESN.
Additional Information
Vehicle Year: |
1989.5,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018 |
Vehicle Make: |
DODGE |
ENGINE: |
5.9L,6.7L |
Part Type: |
Oil Cap O-Ring |
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