The Pontiac Grand Am is a mid-size car and later a compact car that was produced by Pontiac. The Grand Am had two separate three-year runs in the 1970s: from 1973 to 1975, and again from 1978 to 1980. It was based on the GM A platform. Production of the intermediate sized Grand Am was canceled in 1980 when it was replaced by the Pontiac 6000. The compact-sized Grand Am was reintroduced in 1985 when it replaced the Pontiac Phoenix. It became Pontiac's best selling car and was later replaced by the Pontiac G6, so named as it was intended to be the 6th generation of the Grand Am. All 1973–1975 Grand Ams were built in Pontiac, Michigan at Pontiac's main assembly plant. The 1978-1980 Grand Ams were built in Pontiac, Michigan at Pontiac's main assembly plant and in Atlanta, Georgia at GMAD Lakewood. All Grand Ams between 1985 and 2005 were built in Lansing, Michigan at the Lansing Car Assembly. 1973–1975 The history of Grand Am begins with Pontiac executives noting incursion into the US market by Mercedes, BMW, Toyota and Nissan. Notably, the American sports car was usually without luxury features, and the luxury car without sport features. Foreign makes mixed these features, that introduced the market to luxury performance coupes and sedans that had balanced handling along with powerful engines. Pontiac hybridized the Grand Prix with the Trans Am to create the Grand Am, a naming tactic shared with the luxury Pontiac Grand Ville. Built on the A-body platform shared with the Pontiac LeMans, the intended GTO body was re-badged and fitted with the top-level Grand Prix interior, and using the larger engine from the Grand Prix, Bonneville and Grand Ville. The original Grand Am was introduced in the fall of 1972 as a 1973 model. It was based on the GM A platform (A-body) along with other cars such as the Chevrolet Chevelle Laguna, Oldsmobile Cutlass Supreme, and the Buick Century Gran Sport. The GM A-body platform had major design revisions in 1973 that included the elimination of pillarless hardtops due to proposed Federal rollover standards, but with frameless windows similar to that of a hardtop. No convertibles were produced due to the rollover standards (that were not enacted). In addition to Federal emissions regulations, new safety standards required a impact-resistant front bumper and a impact-resistant rear bumper, which increased to for 1974. The 1973 oil