Nissan RB20DET RB25DET RB30 + Holset HX30 HX35 HX40 Turbo Oil Drain Hose Kit

High-Flow Oil Drain System for RB Engines Running Holset HX-Series Top-Mount Turbos

The Holset HX30, HX35, and HX40 are widely used high-flow turbochargers for RB20DET, RB25DET, and RB30 builds, offering excellent durability and strong boost capability across a broad power range.

Because these HX-series turbos move a significantly larger oil volume through the CHRA, a proper high-flow oil drain system is essential to maintain stable lubrication and prevent oil pooling or smoking.

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

Designed specifically for the demands of Holset high-flow turbos on RB platforms, it supports clean, unrestricted oil evacuation even under high boost and elevated temperature.

Key Features

‣ Application: Nissan RB20DET / RB25DET / RB30 — Skyline R32 / R33 / R34 (top-mount turbo setups)
‣ Turbo Compatibility: Holset HX30 / HX35 / HX40
‣ High-Flow Drain Geometry: Enlarged flange outlet and hose diameter prevent return restriction on large-frame Holset turbos
‣ Hose Construction: Large-diameter high-temp NBR oil drain hose suited for sustained high-heat cycles
‣ Flange Material: 6061-T6 CNC-machined aluminum Holset drain flange
‣ Fittings: Mild-steel drain fittings engineered to seal securely under RB engine vibration
‣ Gasket: Interface N-8092 1 mm non-asbestos gasket
‣ Hardware: Stainless clamps + class 8.8 high-tensile bolts
‣ Performance Benefit: Ensures unrestricted oil evacuation at high boost, extended RPM, and elevated CHRA temperature
‣ Custom Length Option: Hose length can be customized for different manifold layouts and top-mount turbo heights

Kit Includes

• Large-diameter high-flow NBR oil drain hose
• 6061-T6 CNC-machined Holset HX-series drain flange（enlarged bottom port）
• 1 mm Interface N-8092 gasket
• Mild-steel oil drain fittings
• High-tensile bolts
• Hose clamps

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

Holset HX30 / HX35 / HX40 turbos require a properly sized oil return path, especially when mounted high on RB top-mount manifolds.
This Gryphontek kit provides the correct enlarged-port flange, hose, and hardware to maintain smooth, reliable oil drainage.

⚙️ Upgrade your RB top-mount turbo system with a high-flow oil drain kit engineered for Holset HX30 / HX35 / HX40.