Tracer Products' TP-3400 Dye-Lite all-in-one full-spectrum fluorescent dye pinpoints leaks in all oil and oil-based fluid systems, including engine oil, synthetics, fuel, automatic transmission fluid, power steering, and petroleum-based hydraulic fluid. The all-in-one dye contains two distinct fluorescent dyes to ensure optimum leak detection; one dye fluoresces best under UV light, and the other under blue light. The dye is highly concentrated and requires minimal dosage. In use, the dye circulates through a vehicle’s fluid system and escapes with the host fluid through all leaks. When the system is scanned with a high-intensity UV or blue light inspection lamp, the dye fluoresces a bright yellow-green, exposing the leak's location.