The SPOOLOGIC Turbo Oil Drain Line SL-350-032 returns oil from the turbocharger center cartridge back to the crankcase on 2011-2016 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LML applications. Built to OE form and fitment, this line keeps drain flow unrestricted so the turbo center section does not pressurize and push oil past the seals.

The OE Oil Drain Line Problem

OE oil drain lines fail from heat-cycled rubber couplers, clogged or kinked tubes, and dried-out O-rings at the slip-fit ends. A restricted drain pressurizes the turbo center section and pushes oil past the seals, showing up as smoke at startup or oil in the intake tract.

Features

• Precision-formed steel hard line holds shape under heat cycles and engine vibration
• Maintains free oil return flow from the turbo to prevent center-section pressurization and seal leaks
• Pre-formed bends and end fittings ensure direct bolt-on fitment — no modifications required
• Includes all required hardware, gaskets, and seals to complete the install in one job

What’s Included

• Hard line steel tube with pre-installed flanges and a flexible bellows section in the middle
• Two gaskets with two bolt holes each
• Two silver bolts with hex heads
• Two copper-colored threaded studs
• Two small silver nuts

Fits 2010.5-2016 6.6L Duramax LML / 6.6L Duramax LGH

• 2011 – 2016 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LML
• 2010.5 – 2016 Chevrolet Express GMC Savana 2500 3500 4500 6.6L Duramax LGH

1-Year Limited Warranty

Every SPOOLOGIC turbo oil drain line is covered by a 1-Year Limited Warranty against defects in materials and workmanship from the date of purchase. Warranty coverage requires that the drain line first be shipped back to SPOOLOGIC for inspection. If SPOOLOGIC determines the failure was caused by a defect in materials or workmanship, the drain line will be repaired or replaced at SPOOLOGIC's discretion. Warranty does not cover damage from improper install, over-torqued flange hardware, reuse of single-use gaskets or O-rings, contaminated oil, extended oil intervals, physical damage from routing against moving components, or corrosion from road salt. Warranty does not cover labor, shipping, towing, downtime, or any other costs outside the drain line itself.