Product Description
Interstate-McBee M-3928624 Turbo Oil Drain O-Ring — 03–18 5.9L / 6.7L Cummins
High-quality replacement O-ring for the turbocharger oil drain/return connection on 2003–2018 Cummins B-series engines (5.9L & 6.7L). Restores a proper seal between the turbo center section and the oil return tube. Sold individually.
- Stop leaks: Replaces hardened or flattened OE seal at the turbo oil drain.
- OE-equivalent: Built to match Cummins specifications for reliable service.
- Easy install: Direct fit—no trimming or sealant required.
- Value: Interstate-McBee quality at an aftermarket price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3928624 |
| OEM Reference | Cummins 3928624 |
| Application | Turbocharger oil drain / return O-ring |
| Sold As | Each (1 O-ring) |
| Position | Between turbo center housing and oil return tube |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- 5.9L Cummins (Common Rail) — 2003–2007
- 6.7L Cummins — 2007.5–2018
- Typical installs: Dodge/Ram 2500 & 3500 pickups; Ram 3500/4500/5500 cab & chassis (where equipped)
What’s Included
- (1) Turbo oil drain O-ring, P/N M-3928624
Recommended/Related Parts
- Turbo oil drain/return tube
- Turbo oil drain flange/gasket hardware
- Fresh engine oil & cleaner for mating surfaces
Install Notes
- Clean mating surfaces; remove all old rubber and residue.
- Lightly lubricate the new O-ring with clean engine oil before assembly—do not use RTV/sealant.
- Align the return tube squarely to avoid pinching; torque fasteners to spec.
- Start engine and check for leaks at operating temperature.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and hassle-free returns
- Deep inventory of Cummins B-series maintenance parts
FAQ
How many O-rings do I need?
One per turbo oil drain connection. If the tube has additional seals, replace those as needed.
Do I need sealant?
No. This is an O-ring seal—use a light film of clean oil only.
Will this fit both 5.9L and 6.7L?
Yes—this M-3928624 O-ring covers 2003–2018 Cummins B-series applications where Cummins 3928624 is specified.
