Duramax T4 S300/S400 Turbo Drain Kit

Upgrade the oil drain system on your aftermarket T4 turbo conversion with the G&R Diesel Duramax T4 S300/S400 Turbo Oil Drain Kit. Designed for 2001–2016 Duramax engines, this kit replaces restrictive or failure-prone factory-style drain setups with a high-quality braided stainless steel line and precision billet aluminum adapters for reliable oil return and a cleaner installation.

Premium Construction & Materials

This kit features a high-quality braided stainless steel oil drain line paired with billet aluminum adapters at both the engine and turbo ends. The turbo-side oil drain flange utilizes a high-quality O-ring seal instead of the inferior factory paper gasket, delivering superior sealing performance and easier installation.

Key Features & Benefits

• T4 / S300 / S400 Specific Design: Engineered specifically for aftermarket T4-flange turbo conversions using S300 or S400 series turbos (not for stock factory turbos, GRD661026 works with stock).
• Superior Sealing: High-quality O-ring seal on the turbo drain flange eliminates the common issues associated with cheap factory paper gaskets.
• Durable Braided Stainless Line: Provides excellent heat and vibration resistance while offering improved flexibility for cleaner routing.
• Billet Aluminum Adapters: Precision-machined adapters at both the engine and turbo ends ensure a secure, professional fit.
• Easier Installation: O-ring design simplifies assembly and improves long-term reliability compared to paper gasket setups.
• Wide Compatibility: Works on any 2001–2016 Duramax engine when paired with an S300 or S400 T4 turbo conversion.

Important Fitment Note

This kit is designed exclusively for aftermarket T4 S300/S400 turbo setups.
If you need a braided stainless steel drain line for a stock factory Duramax turbo, use part number GRD661026.

Applications

• 2001–2016 Chevrolet Silverado / GMC Sierra 2500/3500 HD with Duramax engines
• T4 turbo conversions using S300 or S400 series turbos

Why Choose the G&R Diesel T4 Turbo Drain Kit?

Proper oil drainage is critical for turbo longevity. This kit addresses common weak points of factory-style drain systems with a robust braided stainless line, billet adapters, and a superior O-ring seal. The result is a cleaner, more reliable, and easier-to-install solution for serious Duramax T4 turbo builds. Designed and manufactured with the quality expected from G&R Diesel.

Part Number: GRD661007

This drain kit pairs perfectly with G&R Diesel T4 turbo oil supply kits and other Duramax performance components for a complete, professional turbo conversion package.