Interstate-McBee M-3973512 Oil Cap O-Ring Seal – 98.5–18 5.9L/6.7L Cummins

Direct-fit oil cap O-ring for 1998.5–2018 Cummins 5.9L & 6.7L ISB applications. Interstate-McBee’s OEM-style aftermarket seal restores a proper oil cap seal to help prevent valve cover residue, odors, and leaks.

• Aftermarket value: OEM-style form, fit & function at a great price.
• Direct-fit replacement: Seats in the factory oil cap groove for a quick install.
• Durable elastomer: Built to handle heat, oil exposure, and vibration.
• Maintenance must-have: Cheap insurance during oil changes or valve cover service.

Specifications

Vehicle Fitment

Always verify by VIN/ESN for edge cases and build-date splits.

• Dodge/Ram 2500 & 3500 – 5.9L Cummins
  • 1998.5–2002 24-Valve ISB
  • 2003–2007 5.9L ISB (Common Rail)
• Ram 2500/3500/4500/5500 – 6.7L Cummins
  • 2007.5–2018 6.7L ISB

Install Notes

• Lightly oil the new O-ring before install; seat fully in the cap groove.
• Inspect the oil cap for cracks or damaged threads and replace if necessary.
• Clean any oil residue on the valve cover after installation to verify the fix.

Warranty

Interstate-McBee new parts are covered by the manufacturer’s warranty. For terms and claim support, contact us with your order number and engine details.

Why Buy From CPP Diesel

• ESN-verified fitment support from real diesel techs.
• Fast shipping and hassle-free returns.
• Curated Cummins parts to complete the job right.

FAQ