This document summarizes a research paper on a proposed six-stroke internal combustion engine that uses R-123 refrigerant as a secondary working fluid to recover waste heat from the engine's cooling system. It begins by explaining how current engines waste about 30% of their energy through cooling and exhaust. The document then describes how a six-stroke engine works, using two additional strokes to inject a secondary fluid after the exhaust stroke. It proposes using R-123 refrigerant and models its ideal thermodynamic cycle. Thermal and fluid analyses demonstrate that this design could theoretically recover 23 kW of power from the engine's waste heat. This six-stroke cycle has the potential to improve engine efficiency by harnessing currently wasted energy.