Two Indianapolis entries sponsored by STP for 1965 were the all new STP Oil Treatment (No. 6) and STP Gasoline Treatment Special (No. 9). Both featured patented a Ferguson four-wheel-drive system and both are powered with updated Novi overhead camshaft V-8 engines with 775 HP. At right is Andy Granatelli, President of Paxton Products, and at left is his brother Vincent Granatelli, builder of car No. 6, May 1965. Andy Granatelli Collection, Archives Center, National Museum of American History (AC1403-0000033)