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The paper presents the mathematical formulation and procedure of an ongoing developmental work on the optimum design of engine and body mounts at a total system level. The objective of this study is to develop engine and body mount characteristics to minimize the engine induced and the road load induced vibrations over a wide frequency range. The computer software LOHITSA/SYS_OPT, a total system level non-linear unconstrained optimizer with built-in component mode synthesis solution technique, is used to develop the optimum engine and body mount characteristics. A typical total system level model consists of the body and/or frame, powerplant, suspension, body mount, engine mount etc. Complex structural systems such as body, frame and powertrain are represented as typical modal models (assumed), along with typical physical models of engine mount, body mount and suspension.