The Errecom product TR1203.01, known as "Brilliant Engine," is a fluorescent UV dye designed to detect even the smallest leaks in various parts and components of vehicle engines. It is effective in engine lubricants, hydraulic oil, power steering oil, transmission oil, and diesel or petrol fuels. The recommended dosage is 7.5 mL per 1 liter of oil. Once added, any leaks can be identified by exposing the area to a UV lamp, where the dye will fluoresce, indicating the leak's location.