A cavitation system with a high-pressure function, tens of times superior to its competitors, enables the processing of heavy crude oil in combination with an additive to increase the yield of light fractions from crude oil with a density greater than 0.900 kg (see Products section) by up to 20% or more (depending on the feedstock). This enables a significant premium in the oil refining process. The system is versatile and can handle any type of petroleum product to produce fuel with a higher value depending on the application.