Publisher Summary This chapter discusses the use of uncommon methods for upgrading heavy feeds. Rather unusual approach used for upgrading heavy petroleum feeds involves the use of ultrasonic energy, electric field, and magnetic field. The ultrasonic treatment was used to treat heavy gas oil (HGO) at a near atmospheric pressure in the absence of additives. The information indicating the use of the ultrasonic treatment for upgrading the metals- and asphaltenes-containing feeds is limited although the weak chemical bonds present in asphaltenes and porphyrin molecules may serve as potential sites for the cleavage followed by depolymerization. The viscosity reduction of crude oil was achieved by applying either an electric or magnetic field. Paraffinic and intermediate crudes, as well as a heavy crude oil, have been investigated. The method had little effect on the temperature of crude oil. Among the crude oil tested, the most pronounced effect was observed for the paraffinic crude oil.