CUMMINS 3934084 OEM FLEXIBLE TURBO OIL DRAIN TUBE – RAM 5.9L/6.7L (21" LENGTH)

CUMMINS 3934084 OEM FLEXIBLE TURBO OIL DRAIN TUBE – RAM 5.9L/6.7L (21" LENGTH)

The CUMMINS 3934084 OEM flexible turbo oil drain tube is the genuine B-series turbocharger oil return connection designed to move hot oil quickly and cleanly from the turbocharger back to the crankcase. This ~21" flexible tube maintains proper OE drain routing on high-mounted or center-dump turbo setups, helping prevent oil pooling in the turbo center section, reducing the risk of leaks, smoke, and premature turbo seal failure.

Unlike generic hoses or cut-to-fit lines, this genuine Cummins drain tube uses the correct bend profile, length, and materials for long-term durability on Ram 5.9L and 6.7L Cummins applications that call out part number 3934084. If you are upgrading to a 3-piece or center-dump manifold, moving the turbo higher, or simply refreshing a tired drain line, this is the OE part your build sheet expects to see.

Key Features & Benefits

• Genuine Cummins 3934084 turbocharger oil drain connection – not an aftermarket copy.
• Approx. 21" flexible design to reach higher- or center-mounted turbos while maintaining a downhill drain path.
• Engineered for B-series and ISB 5.9L/6.7L Cummins applications using a flexible turbo oil return.
• Resists heat, vibration, and collapse for reliable long-term oil drainage.
• Helps reduce oil leaks, coking, and turbo seal stress caused by poor drain routing or kinked hoses.

Fitment Details

This flexible turbo oil drain tube is commonly used on B-series and ISB Cummins engines where the factory or service information specifies Cummins 3934084. Automotive fitment typically includes:

• 1989–2002 Dodge Ram 2500/3500 – 5.9L Cummins (12V & 24V) – applications using a 21" flexible drain.
• 2003–2007 Dodge Ram 2500/3500 – 5.9L ISB (24V common-rail) with turbo/manifold combos that require extended drain length.
• 2007.5–2018 Ram 2500/3500 – 6.7L ISB (24V common-rail) on builds using a flexible center-dump style drain routing.
• Various Cummins B-series/ISB industrial and medium-duty engines where 3934084 is listed as the turbocharger oil drain connection in the Cummins parts catalog.

Important: Because turbo location and drain flange style can vary (especially with aftermarket turbos and 3-piece manifolds), always confirm by engine serial number (ESN), turbo orientation, and required drain length before ordering.

What’s In The Box

• (1) Genuine Cummins 3934084 flexible turbocharger oil drain tube (approx. 21" length)
• Seals, O-rings, bolts, and gaskets are sold separately.

Recommended Cummins Companion Parts (Cross-Reference on CPP Diesel)

Pair this drain tube with other genuine Cummins turbo drain components available at CPP Diesel:

• CUMMINS 5264568 OEM TURBO OIL DRAIN GASKET – RAM 5.9L/6.7L (2003–2018)
• CUMMINS 3918585 OEM TURBO OIL DRAIN TUBE – RAM 5.9L (1994–2002)
• CUMMINS 3920706 OEM EXPANSION PLUG (TURBO DRAIN) – RAM 5.9L/6.7L (1989–2018)
• CUMMINS 3903744 OEM TURBO OIL DRAIN ELBOW – RAM 5.9L (1994–2002)
• CUMMINS 3949769 OEM ENGINE OIL PAN – 5.9L CUMMINS (2003–2007)
• CUMMINS 3973071 OEM ENGINE OIL PAN DRAIN PLUG – RAM 5.9L/6.7L (2003–2024)

Installation Tips

• Mock up the tube first and verify a continuous downhill slope from turbo to crankcase – no sags or “U” bends.
• Always use new O-rings/seals on both ends of the drain connection; lightly oil them before installation.
• Torque mounting hardware to the specs in your Cummins/Ram service manual.
• After the first heat cycle, re-inspect for seepage and confirm clearance around manifolds, downpipes, and chassis components.

FAQ

In many cases, yes. This part is used across numerous B-series and ISB 5.9L/6.7L Cummins applications, including Ram 2500/3500 trucks where a 21" flexible drain is specified. Because turbo and manifold combinations vary, always confirm by engine serial number (ESN), existing part number, and required drain length before ordering.

The tube is approximately 21" overall. Actual installed length depends on routing and turbo location, but this part is engineered to reach higher or center-dump turbo positions while keeping a proper gravity drain.

No. The CUMMINS 3934084 flexible drain tube is sold by itself. We recommend replacing the turbo drain gasket and any related O-rings or fasteners at the same time using genuine Cummins parts such as CUMMINS 5264568 and CUMMINS 3920706 where applicable.

Yes, as long as the turbo uses an OE-style drain flange or adapter that matches the factory Cummins configuration and the 21" length provides proper routing. Many high-mount or 3-piece manifold turbo upgrades are specifically designed to use this 3934084 flexible drain. Verify flange style and orientation before installation.

This is a genuine Cummins 3934084 turbocharger oil drain connection sourced through CPP Diesel – built to OEM standards for material quality, flexibility, and long-term durability in demanding diesel applications.

Specifications for cummins 3934084