A method for controlling an internal combustion engine using model based control, the engine including a variable geometry turbocharger driven in response to a VGT command signal andor an exhaust gas recirculation valve driven in response to an EGR valve command signal to recirculate exhaust to an engine intake manifold. The driven pulley assembly includes a ratio adjustment mechanism that adjusts the position of a rear sheave relative to a forward sheave. ; and reacting the succinimide product of step with an acidic molybdenum compound to provide the molybdated succinimide complex, wherein the molybdated succinimide complex prepared is a liquid at room temperature. A retaining protruding piece extending from a side portion opposite to a protruding portion and engaging with corresponding side portion of the shaft portion is formed on each both side leg portions. The fine gauge of the mesh prevents combustion from flowing backwardly into the fuelair mixture space.