Abstract <p>The article is devoted to the study of the possibility of reducing the cost of complex calcium sulfonate grease (CCSG) through the use of by-products of the production of ultra-alkaline calcium sulfonate (UCS). The purpose of the work is to evaluate the prospects for the use of calcium compound concentrate (CCC), a by-product of the production of UCS, to reduce the cost of CCC production while ensuring a given level of their operational characteristics. The article proposes a variant for the manufacturing of CCSG based on sulfonated compounds of various origins and describes a method for monitoring the synthesis using infrared (IR) spectrometry. The synthesis of CCSG samples based on UCS and a concentrate of calcium compounds is described, with control of the lubricant manufacturing process using IR spectroscopy and assessment of its rheological properties and tribological characteristics (penetration, drop point, colloidal stability, welding load, and critical load). It has been established that samples of lubricants based on UCS and CCS demonstrate high performance characteristics comparable to their foreign counterparts. It is shown that the use of by-products of UCS production is acceptable and advisable, while it opens up the possibility of reducing the cost and improving the environmental conditions of CCSG production.</p>