AN Male Turbo Oil Return Drain Flange

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£18.89

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Turbo Oil Drain Flange – AN10 CNC Billet, 1.5"/2" Bolt Spacing with O-Ring

Ensure optimal oil return flow in your turbo system with this robust turbo oil drain flange, designed for high performance and long-term reliability. CNC-machined from premium billet aluminium alloy, this turbo oil return flange features a thick, heavy-duty base that resists warping and leakage, even under extreme engine bay temperatures.

Why Choose This Turbo Oil Return Flange?

Heavy-Duty CNC Billet Aluminium

Precision-machined for a perfect seal, this turbo oil flange combines lightweight aluminium with a reinforced base for strength and vibration resistance—ideal for motorsport and turbo conversions.
Funnel-Shaped Oil Inlet for Efficient Drainage

The internal oil passage is funnel-shaped to improve oil discharge and reduce the chance of oil back-up—helping protect your turbocharger’s bearings and extend turbo life.
Integrated O-Ring Seal

Unlike traditional flat gaskets, this turbo oil drain flange uses an integrated O-ring design for a cleaner, more reliable seal. It helps prevent leaks and makes installation faster and simpler.
AN10 Male Flare Fitting

Features a built-in AN10 male fitting, perfect for connecting -10AN braided oil return hoses—no welding or extra adapters required.
Available in 1.5" or 2" Bolt Spacing

Select the correct bolt hole spacing to match your turbo:
- 38mm (1.5") centre spacing – for GT15, GT25, GT28, etc.
- 50.8mm (2") centre spacing – for T3/T4, Garrett, BorgWarner, Precision, Holset, etc.
Complete Turbo Drain Flange Kit

Includes 2x M8 x 1.25 bolts, 2x M8 spring washers, and a high-temp O-ring—everything needed to install your turbo oil return flange cleanly and securely.

Perfect for drift builds, time attack cars, track projects or turbo conversions, this AN10 turbo oil drain flange is engineered for serious performance and leak-free reliability.

Turbo Oil Return Flange: 1 x Billet Aluminium Flange Supplied in the selected bolt spacing with an integrated O-ring seal
Mounting Hardware: 2 x M8 x 1.25 Bolts 2 x M8 Spring Washers For installing the flange to the turbocharger

Material: Billet Aluminium Precision CNC machined
Seal: Integrated O-Ring Provides a reliable, leak-resistant seal
Oil Passage: Funnel-Shaped Oil Passage Promotes unrestricted oil drainage

Bolt Hole Spacing: 1.5" (38mm) 2.0" (51mm) Select to match your turbocharger
Hose Connection: AN10 Male Flare For AN10 braided oil return hoses
Mounting Bolt Threads: M8 x 1.25 Two mounting bolts supplied

Compare available turbo oil return flange options
Specification	1.5" Flange	2.0" Flange
Product Code	OIL-FLA-15-AN10-AL	OIL-FLA-20-AN10-AL
Bolt Hole Spacing	1.5" 38mm	2.0" 51mm
Overall Length	54mm 2.1"	70mm 2.8"
Compatible Turbochargers	Mitsubishi TD015 TD02 TD03 TF035 TD04 TD05 TD06 IHI RHB4 RHB5 RHF4 KKK K03 K04 K06 Garrett GT15 GT17 GT1544 GT1749 GT2052 GT2056 GT2252 GT2259 Greddy T517Z T518Z	T-Series T3 T4 T04B T04E Hybrid & GT-Series T3/T4 Hybrid GT30 GT32 GT35 Large-Frame Turbos T60 T61 T66 T60-1 T70 Super 70

Always verify your turbocharger's bolt hole spacing before ordering. The 2.0" flange is not compatible with turbochargers using a 61mm bolt hole spacing.

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What is a turbo oil drain flange used for?
A turbo oil drain flange connects the turbocharger’s oil outlet to the oil return line, allowing oil to return to the sump under gravity. It ensures your turbo oil return is smooth and free-flowing to avoid bearing damage or pressure build-up.
What makes this turbo oil return flange different?
This turbo drain flange features a funnel-shaped oil inlet to maximise drainage efficiency and reduce oil back-up—extending turbo life. It also uses a thick, rigid base to prevent warping under heat and vibration.
What size fitting does it use?
This turbo oil flange includes an integrated AN10 male flare fitting, suitable for -10AN braided oil return hoses—commonly used in high-flow turbo setups.
What’s the bolt spacing and compatibility?
Two sizes are available:
- 38mm (1.5") – GT15, GT17, GT25, GT28, and other small-frame turbos
- 50.8mm (2") – T3/T4, Garrett, BorgWarner, Precision, Holset, and others
What’s included with this turbo drain flange?
Each kit includes a turbo oil drain flange, high-temp O-ring, 2x M8 x 1.25 bolts, and 2x spring washers. It's a ready-to-fit solution with no extras needed.
Is the O-ring better than a traditional gasket?
Yes. The integrated O-ring design provides a more consistent, leak-resistant seal than paper or fibre gaskets. It's easier to install and reusable if undamaged.
Can I use this turbo oil drain flange for custom builds?
Absolutely. This flange is perfect for custom turbo setups, engine swaps, or motorsport builds where space, flow, and durability are key.