Nissan RB20DET RB25DET RB30 + Garrett G-Series G40 G42 G45 Turbo Oil Drain Hose Kit

High-Flow Oil Drain System for RB Engines Running G40 / G42 / G45 Top-Mount Turbos

Garrett’s G-Series G40, G42, and G45 represent the latest generation of high-efficiency large-frame turbos, offering exceptional compressor aerodynamics, improved transient response, and massive flow capability for high-horsepower RB20DET, RB25DET, and RB30 builds.

Because these turbos sit higher in top-mount configurations and use a large-capacity CHRA, a dedicated high-flow oil drain system is essential to avoid oil pooling, smoking, and return-line restriction.

This Gryphontek turbo oil drain hose kit includes a CNC-machined Garrett G-Series large-frame drain flange with an enlarged bottom port, a large-diameter high-temperature NBR drain hose, heavy-duty steel fittings, a 1 mm non-asbestos gasket, and high-tensile bolts.

Optimized for high-boost and high-temperature operation, it ensures unrestricted oil evacuation for G40/G42/G45 turbo applications on RB platforms.

Key Features

‣ Application: Nissan RB20DET / RB25DET / RB30 — Skyline R32 / R33 / R34 (top-mount turbo setups)
‣ Turbo Compatibility: Garrett G40 / G42 / G45 (large-frame G-Series)
‣ High-Flow Drain Design: Enlarged flange outlet + oversized hose to support increased CHRA oil volume
‣ Hose Construction: Large-diameter high-temp NBR oil drain hose for continuous heat exposure
‣ Flange Material: 6061-T6 CNC-machined aluminum G-Series drain flange
‣ Fittings: Mild-steel oil drain fittings designed for secure sealing on RB inline-six engines
‣ Gasket: Interface N-8092 1 mm non-asbestos gasket
‣ Hardware: Stainless hose clamps + class 8.8 high-tensile bolts
‣ Performance Benefit: Prevents CHRA oil pooling during high boost, long pulls, and elevated exhaust temperature
‣ Custom Length Option: Hose length can be customized for different manifold layouts and turbo heights

Kit Includes

• Large-diameter high-flow NBR turbo oil drain hose
• 6061-T6 CNC-machined G-Series G40/G42/G45 drain flange（enlarged bottom port）
• 1 mm Interface N-8092 gasket
• Mild-steel drain fittings
• High-tensile bolts
• Hose clamps

High-Flow Oil Return for G-Series RB Top-Mount Turbo Builds

Garrett G40 / G42 / G45 turbos require a properly sized oil return system to maintain CHRA reliability and avoid oil flooding—especially in top-mount installations.
This Gryphontek kit provides the correct enlarged flange, hose, and hardware to support smooth, unrestricted oil evacuation.

⚙️ Equip your high-power RB build with an oil drain system engineered for Garrett G40, G42, and G45 turbos.