INTERSTATE-MCBEE M-3678603 TURBO OIL INLET O-RING 07.5–18 6.7L CUMMINS (AFTERMARKET REPLACEMENT)

Product Description

Interstate-McBee M-3678603 Turbo Oil Inlet O-Ring – 2007.5–2018 6.7L Cummins

Replacement turbocharger oil inlet O-ring for the 6.7L Cummins (2007.5–2018). Seals the oil feed at the turbo to prevent leaks and pressure loss. Sold individually.

• Direct replacement: OE-style seal for factory turbo oil feed inlet.
• Reliable sealing: Proper crush and elasticity for hot oil service.
• Maintenance friendly: Ideal to replace any time the turbo or feed line is serviced.
• Value: Interstate-McBee quality at an aftermarket price.

What’s Included

• (1) Turbo oil inlet O-ring, P/N M-3678603

Vehicle Fitment

Always verify by engine serial number (ESN) when possible.

• Ram 2500/3500/4500/5500 with 6.7L Cummins diesel
  • Model Years: 2007.5–2018
• Additional 6.7L Cummins B-Series applications using Cummins 3678603 (confirm by ESN).

Recommended/Related Parts

• Turbo oil feed line seals and gaskets
• Turbo oil drain tube gasket/O-ring
• Turbo mounting hardware (studs/nuts)
• Fresh engine oil and filter (after turbo service)

Install Notes

• Clean mating surfaces and lightly lubricate the new O-ring with fresh engine oil before installation.
• Do not twist, nick, or over-stretch the O-ring during assembly.
• Tighten fittings/fasteners to manufacturer torque specs and check for leaks after startup.

Why Buy From CPP Diesel

• Knowledgeable diesel specialists with ESN-verified fitment support
• Fast shipping, easy returns, competitive pricing
• Deep inventory of Cummins turbo & sealing components

FAQ

Is this the O-ring that seals the turbo oil feed into the turbo?

Yes. This ring seals the oil inlet at the turbocharger. If the feed line is removed, you should replace this O-ring.

How many do I need?

One per turbo oil inlet. Most trucks require a single O-ring.

Will it fit 2019+ 6.7L trucks?

This listing is for 2007.5–2018. Later models may use different seals—verify by ESN or parts catalog.