TSI Supercool RD8 Radiator Dye – 8-Oz Self-Measure UV Leak Detection Bottle

TSI Supercool RD8 Radiator Dye is a synthetic UV-detectable leak tracer designed to help you identify cooling system leaks without invasive disassembly. Packaged in an 8-ounce self-measure bottle, it lets you apply precisely 1 ounce per vehicle, making routine maintenance simpler and more predictable.

What makes RD8 effective

The dye blends with your vehicle’s coolant and travels along with it, turning transparent pathways into visible indicators under UV light. When you shine a UV light on the engine bay, potential leak points—such as hoses, radiators, and connections—may show up as glowing traces, helping you target inspections with confidence rather than guesswork.

Designed for water-cooled engines, this dye is formulated to be detectable with any UV light, so you can use standard shop lamps or portable UV devices to review results. The result is a practical aid for diagnostics that supports planning repairs or monitoring system integrity over time.

Key benefits at a glance

• Synthetic UV leak detection dye that works with any UV light
• Turns leaks or damp areas into visible signals for easier pinpointing
• Self-measuring bottle with clear 1-ounce dosing per vehicle
• 8-ounce bottle provides multiple treatments for various vehicles
• Specifically formulated for water-cooled engines and cooling systems

Ideal uses and scenarios

• Fast preliminary checks during routine maintenance or after coolant service
• Diagnostics for cars, light trucks, and other water-cooled engines
• Verification of suspected leak sites before more invasive repairs
• Compatibility with standard UV lighting makes it a flexible diagnostic tool

How to use

1. Shake the bottle to mix the dye with the coolant.
2. Use 1 ounce per vehicle as a dosing guideline.
3. Run the engine and observe under UV light for glowing leak indicators.
4. Inspect hoses, radiator, water pump, seams, and clamps for signs of leakage.

RD8 offers a practical option for proactive maintenance, helping you visualize where cooling system integrity could be at risk. While results can vary with engine design and conditions, many users find it useful for faster diagnostics and informed decision-making.