NOVELTY - Supported, heterogeneous catalyst system comprises: a mixed metal oxide catalyst; the catalyst including calcium oxide and at least one additional metal oxide; and a metal oxide support upon which the catalyst is deposited, where the metal oxide support exhibits basic properties and provides a synergistic effect to the mixed metal oxide catalyst in catalyzing transesterification reactions.    USE - The supported, heterogeneous catalyst system used for the production of a biodiesel product from the transesterification of an oil.    ADVANTAGE - The supported catalyst system reduces the cost of producing biodiesel due to catalytic activity and stability during transesterification reactions. The supported catalyst system exhibits: maximum stability and minimized calcium leaching; a synergistic effect to the basic properties in transesterification reactions; high catalytic activity; and high durability in the reaction medium.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of forming a biodiesel product from the transesterification of an oil, comprising: preparing the supported heterogeneous catalyst system; placing an oil feedstock and an alcohol in contact with the catalyst system to form a reaction mixture; heating the reaction mixture to a predetermined temperature; allowing the transesterification of the oil feedstock to occur for a predetermined time to form fatty acid methyl esters resulting in a biodiesel product; and separating the catalyst from the biodiesel product, to collect the biodiesel product;    (2) a biodiesel product formed by reacting an oil with an alcohol in the presence of the supported catalyst system; and    (3) a method of preparing the supported, heterogeneous catalyst system comprising: heating a metal oxide support to an elevated temperature for a predetermined time; cooling the support down to room temperature; preparing solutions of calcium nitrate and lanthanum nitrate; mixing together the solutions and adding them to the support to form a reaction mixture (120); kneading the reaction mixture until a uniform state is formed; pressing the uniform reaction mixture to make pellets (130); drying the pellets at room temperature; heating the pellets at a rate of 2 K/minute up to 1500 degrees C (140); cooling the pellets down to room temperature (145); and reheating the pellets up to 850 degrees C followed by cooling them back down to room temperature while they are in an inert atmosphere (150).    DESCRIPTION OF DRAWING(S) - The figure shows the schematic representation of a method of preparing and pelletizing the supported catalyst system.    Mixing calcium nitrate and lanthanum nitrate solutions and adding them to support after it cools down (120)    Pressing the mixture to make pellets (130)    Heating the pellets at a rate of 2 K/minute up to 1500 degrees C (140)    Cooling the pellets down to room temperature (145)    Heating the pellets up to 850 degrees C, and cooling them down in an inert atmosphere (150)