A/C Pro Certified Auto Pro Oil and Fuel System UV Dye Leak Detection for Cars & Trucks & More, 1 Oz, 374CS, Universal

Customers find the UV dye works well for finding leaks, with one noting it's best when starting with a clean engine. The product receives positive feedback for its quality and value, helping save money and time, and customers find it easy to use. The dye's glow and color visibility receive mixed reviews - while some praise its bright yellow glow under UV light, others note it's not very bright when mixed with fluids, and while some find it highly visible, others say it's hard to see.