Training Manual . Moscow, Russian State University of Oil and Gas . and . M. Gubkina, 2008. 93 s . A set of teaching aids is intended for students, Graduate and post-graduate students , students in the direction of 553600 "Oil and gas business" and the program "Oil and gas nanotechnology for the development and operation of fields" , as well as for students of the Training and Research Center for Advanced Training . Part 4 includes the materials of the report on the contract study conducted by the author on request and with the financing of the Institute of Oil and Gas Problems of the Russian Academy of Sciences in 2007. Awareness of the presence of specific problems of "incompatibility" in the mixing of oil, bitumen and petroleum products . Existing tests for "incompatibility" of oils when mixed. Empirical criteria for potential "incompatibility" due to precipitation of asphaltene colloids. Structural phase transformations of nanocolloids of asphaltenes weighted in oil volume. Manifestations of Incompatibility in Mixtures of Natural Oils Based on Real Measurements (Laboratory Experiments) production tests), Conversions of asphaltene colloids in mixtures of natural oil - a "good" solvent according to real measurements (laboratory experiments,) production tests), Manifestations of incompatibility in mixtures natural oil - paraffin solvent according to real measurements (laboratory experiments, production tests), Practical application of solvents for the development of bitumen deposits in Canada