For 1965 a modest facelift increased overall length to 204.3 inches (5,190 mm) while the front end received a "dumbbell-style" grille similar to full-sized Olds models. A bigger 400 cu in (6.6 L) engine was included with the 442 option, based on the newly introduced 425 cu in (6.9 L) engine from the full-sized Oldsmobiles while the Oddfire Buick 225-cubic-inch (3.69 L) V6 and Olds 330 cubic-inch Jetfire Rocket V8 were carried over from the previous year with increased power ratings for the V8 options. Sales increased again to 187,097. The year 1965 was the first for Oldsmobile's "Rocket" logo that would last, with minor variations, until the 1990s.
Source: Wikipedia, 2012