NOVELTY - Making biodiesel from nyamplung waste oil using H-bentonite catalyzed esterification process involves: a) extracting gum from nyamplung oil by using 96% ethanol; b) heating oil at a temperature of 78 degrees C to evaporate the ethanol; c) esterifying nyamplung oil free of gum with methanol, where the mole ratio of nyamplung oil and methanol is 1:12; d) adding solid acid catalyst in 5% of the total weight of nyamplung oil and methanol into a three-neck flask; and e) separating biodiesel from other components by centrifuge, and separating excess methanol with a separating funnel.    USE - For making biodiesel from nyamplung waste oil using H-bentonite catalyzed esterification process; for making biodiesel by converting triglycerides into biodiesel and glycerol using transesterification process (claimed), where biodiesel is used as an alternative to solar energy and as alternative fuel for diesel engines.    ADVANTAGE - The biodiesel product formed by the method exhibits specific-density at 60/60 degrees F of 0.8766, Kinematic viscosity at 40 degrees C of 4.695 cst, Pour point of 9 degrees C, Fog-point of 12 degrees C, Flash point of 192.5 degrees C, Water content % volume of trace amount, Conradson carbon remaining of 0.046%, and calorific value of 9759.96 cal/g. The biodiesel formed is environmentally friendly, biodegradable, and non-toxic.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a process (P1) of making biodiesel by converting triglycerides into biodiesel and glycerol using transesterification process, involving: i) mixing oil with methanol in esterification process, where the mole ratio of oil and methanol is 1:6 to produce a mixture; ii) mixing the resultant of step (i) with a wet catalyst NaOH (1 wt.% of total weight of oil and methanol); iii) refluxing the resultant of step (ii) at a temperature of 60 degrees C for 150 minutes; iv) cooling the resultant of step (iii); and v) forming three layers, where the top layer is of biodiesel, middle layer is of glycerol and the bottom layer is of soap;    (2) new catalysts for the manufacture of biodiesel from nyamplung oil having acidity of 2.59 mmol/g (pyridine); and    (3) biodiesel product formed by the method indicated by: specific-density at 60/60 degrees F of 0.8766, Kinematic viscosity at 40 degrees C of 4.695 cst, Pour point of 9 degrees C, Fog-point of 12 degrees C, Flash point of 192.5 degrees C, water content % volume of trace amount, Conradson carbon remaining of 0.046%, and calorific value of 9759.96 cal/g.