The engine family known as the Quad 4 was debuted to the public in the spring of 1987. The Quad 4 was a 2,260.5 cc (2.2605 L; 137.94 cu in) DOHC inline 4-cylinder produced by General Motors' Oldsmobile division. Early television ads touting the new engine's abilities showed video of a limited edition Oldsmobile Calais (called the "GMO Quad 4") racing around city streets.The Quad 4 name is derived from the engine's four-valve, four-cylinder layout.
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