NOVELTY - Making an alternative renewable energy resource, comprises: adding a first catalyst (108) and an alcohol (104) as a first step transesterification process to an used oil (102) to make biodiesel; determining a glycerin (112) value number of the used oil to determine an amount for adding a second catalyst and an alcohol to optimize biodiesel production; heating the used oil to raise the used oil temperature; and adding second catalyst and alcohol using an adding process into the used oil for predetermined time, where the addition process is a sequential process or simultaneous process.    USE - The method is useful for making an alternative renewable energy resource and for making biodiesel (claimed).    ADVANTAGE - The process provides superior quality biodiesel in short time, due to the specific ratio of catalyst and alcohol. The biodiesel production is stable and consistent. The biodiesel has a very low ASTM number and the production time may be cut drastically to reduce cost and produce biodiesel efficiently.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: making biodiesel, comprising: either (106) sedimenting a waste material and separating water from an used oil by at least one of centrifugation and holding for a predetermined time duration; reacting the used oil with sodium hydroxide to produce a glycerin and a saponified used oil; removing the glycerin from the saponified used oil and separating the water; estimating a glycerin value to calculate a catalyst and an alcohol content for a transesterification process; heating the oil to 128-1400 degrees F; adding a second catalyst and an alcohol in sequence for a predetermined time; separating the water, glycerin and alcohol from a biodiesel; and estimating ASTM number for the biodiesel and storing the biodiesel; or calculating a glycerin value for an used oil pretreated with a sodium hydroxide and a methanol; adding a calculated amount of potassium hydroxide as a result of glycerin value multiplied by a factor of 5-80%; adding the potassium hydroxide and the methanol and stirring for 15 minutes; and harvesting the biodiesel and determining the ASTM factor for consumption.    DESCRIPTION OF DRAWING(S) - The figure shows process of producing biodiesel by using a sequential step process of adding the catalyst and methanol.    Used oil (102)    Alcohol (104)    Sedimentation process (106)    Catalyst (108)    Glycerin. (112)