Synopsis Developing a high-performance engine requires the capabilities for simultaneously predicting and studying the desired functions and quality of the entire engine at the initial stage of the development process. Vigorous effects have been under way at Nissan to advance the use of tribological technology in R&D activities for new engines and their components. Approaches used up to now have generally treated engine technology in terms of two categories: component technology and assembly technology. Crankshaft bending analysis, which takes into account the oil film pressure distribution, and cylinder bore distortion analysis, based on bolt tightening torque, are examples of techniques used in the component technology category. Engine friction prediction model and lubrication system model are typical tools used in the assembly technology category. It is expected that computer-aided tribology will continue to advance as various technological issues are overcome in the future.