Lucas Emissions Clearâ„¢ Fuel and Exhaust System Cleaner is designed to enhance engine performance and keep your emissions system operating at its peak for the life of the vehicle. Engineered to be easily integrated into routine vehicle maintenance or before a vehicle inspection, expect to avoid costly emission system repairs and increased efficiency. Lucas Emissions Clearâ„¢ is a one tank treatment and provides a thorough clean out, compatible with any gasoline engine which highlights its versatility and reliability.