Cummins 4935577 — Genuine Turbo Oil Feed Supply Line for ISB 5.9L/6.7L

MPN: 4935577  |  Also Known As: turbo oil feed line, flexible hose  |  Cross-Refs (ID only): Mopar 68002982AA, 68418331AA; related assembly/fitting numbers commonly seen: 3965717, 3947931, 3972809

Genuine Cummins flexible oil feed hose that supplies pressurized engine oil to the turbocharger. Direct-fit for 2003–2018 Ram 5.9L/6.7L. Replacing aged lines helps prevent oil leaks and turbo failures. Sold individually (1 per engine).

Features & Benefits

• OE routing & end-form for leak-free connection at block and turbo inlet.
• Durable flexible construction to withstand heat, vibration, and pressure.
• Drop-in fit for factory turbo location on ISB platforms.
• Restores reliable oil supply to protect turbo bearings.
• Backed by Cummins fit, function, and quality.

Verified Fitment (Automotive)

Industrial/Off-Highway: Used on ISB/QSB 6.7 (EPA13+) and some ISB 5.9 industrial variants—verify by ESN for exact build.

Specifications

• Type: Flexible turbocharger oil feed line (hose)
• OE Part Number: 4935577
• Cross-References (ID): Mopar 68002982AA, 68418331AA; related: 3965717, 3947931, 3972809
• Quantity Required: 1 per engine (sold individually)

Often Paired With

• Turbo oil inlet/outlet fitting: Cummins 4940183 (includes O-rings)
• Feed line O-rings (if reusing fittings): (2) x 3922794
• Fresh oil & filter: good practice after any turbo oil circuit work

What’s In The Box

• (1) Genuine Cummins Turbo Oil Feed Line (4935577)
• Fittings/O-rings not included (see “Often Paired With”).

Installation Tips

• Replace both O-rings 3922794 or install new 4940183 fitting (includes O-rings).
• Route the hose per OE path; ensure no chafe points or kinks.
• Torque fittings to spec; warm-engine leak check after start-up.
• Prime turbo oil system per service procedure before hard throttle.

FAQ

WILL THIS FIT MY 2003–2018 5.9L/6.7L CUMMINS RAM?

Yes—4935577 is the OE turbo oil feed line for most 2003–2018 Ram 2500/3500 5.9L & 6.7L applications. Always confirm by VIN/ESN.

DOES THIS LINE INCLUDE FITTINGS OR O-RINGS?

No—order fittings separately or reuse yours with (2) O-rings 3922794. Many installers upgrade to 4940183 (includes O-rings).

WILL IT WORK ON RAM 4500/5500?

Common on 2008–2018 Ram 4500/5500 cab & chassis. Verify by VIN/ESN for your specific build.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins hose 4935577 for correct length, ends, and routing.

HOW DO I KNOW MY FEED LINE NEEDS REPLACED?

Oil seepage at crimp/fittings, brittle hose, or contamination after turbo failure are common reasons to replace it.