Nissan RB20DET RB25DET RB30 + Garrett GT37R GT40R GT42R GT45R GT47R Turbo Oil Drain Hose Kit

High-Flow Oil Drain System for RB Engines Running Large-Frame GT-Series Top-Mount Turbos

Garrett’s large-frame GT37R / GT40R / GT42R / GT45R / GT47R turbos are designed for high-power RB builds, providing massive airflow capacity for drag, street/strip, and high-boost applications.

Due to their elevated mounting position and significantly larger CHRA oil volume, a dedicated high-flow oil drain system is essential to prevent oil backup, smoking, and CHRA flooding—common issues when large-frame turbos are paired with undersized OE-style drains.

This Gryphontek turbo oil drain hose kit features a CNC-machined GT large-frame drain flange with an enlarged bottom port, a large-diameter high-temperature NBR drain hose, durable steel fittings, a 1 mm non-asbestos gasket, and high-tensile hardware.

Engineered specifically for top-mount GT-R series turbos, it ensures clean, unrestricted oil evacuation even under extreme boost and high exhaust temperature.

Key Features

‣ Application: Nissan RB20DET / RB25DET / RB30 — Skyline R32 / R33 / R34 (top-mount turbo setups)
‣ Turbo Compatibility: Garrett GT37R / GT40R / GT42R / GT45R / GT47R (large-frame high-flow turbos)
‣ High-Flow Drain Geometry: Enlarged outlet + oversized hose to prevent oil pooling in large-frame CHRAs
‣ Hose Construction: Large-diameter high-temperature NBR oil drain hose suitable for extreme heat and high oil volume
‣ Flange Material: 6061-T6 CNC-machined aluminum GT large-frame drain flange
‣ Fittings: Heavy-duty mild-steel drain fittings for high-vibration RB inline-six operation
‣ Gasket: Interface N-8092 1 mm non-asbestos gasket
‣ Hardware: Stainless clamps + class 8.8 high-tensile bolts
‣ Performance Benefit: Maintains free-flowing oil evacuation during high boost, long pulls, and elevated CHRA temperature
‣ Custom Length Option: Hose length can be tailored for different manifold layouts and turbo heights

Kit Includes

• Large-diameter high-flow NBR turbo oil drain hose
• 6061-T6 CNC-machined GT37R/GT40R/GT42R/GT45R/GT47R 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 Large-Frame GT-Series RB Top-Mount Turbo Builds

Large-frame Garrett GT turbos move substantial oil volume and require a properly sized, unrestricted drain path—especially in top-mount configurations.
This Gryphontek kit delivers the correct flange, oversized hose, and high-temperature components demanded by GT37R–GT47R RB builds.

⚙️ Support your high-horsepower RB build with a high-flow oil drain system engineered for GT37R, GT40R, GT42R, GT45R, and GT47R turbos.