PREHEAT OVEN TO 325 DEGREES F.
IN A LARGE BOWL, CREAM TOGETHER THE BUTTER, VEGETABLE OIL, 1 CUP WHITE SUGAR AND CONFECTIONERS’ SUGAR UNTIL SMOOTH.
BEAT IN THE EGGS ONE AT A TIME, THEN STIR IN THE VANILLA.
COMBINE THE FLOUR, BAKING SODA, CREAM OF TARTAR, AND SALT; STIR INTO THE CREAMED MIXTURE. MIX IN THE PECANS.
ROLL DOUGH INTO 1 INCH BALLS AND ROLL EACH BALL IN REMAINING WHITE SUGAR. PLACE THE COOKIES 2 INCHES APART ONTO UN~GREASED COOKIE SHEETS. BAKE FOR 10 TO 12 MINUTES IN THE PREHEATED OVEN, OR UNTIL THE EDGES ARE GOLDEN. REMOVE FROM COOKIE SHEETS TO COOL ON WIRE RACKS.