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The Calais nameplate replaced the unsuccessful X-body Omega model. In an unusual move, the Calais name was chosen even though it had previously been used on Cadillacs. For 1988, it became a Cutlass Calais. The Cutlass Calais parts included the famous Quad 4 engine which was unique to the Oldsmobile division at first. This was one of the first double overhead camshaft sixteen valve engines offered by a US automaker and was meant to take on similar designs from Europe and Japan. The design was more advanced and much more powerful than the base pushrod Iron Duke 4. One model to watch for is the monochromatic International Series featuring badges with several of the world's flags on it. The Cutlass Calais was replaced in the lineup by the Oldsmobile Achieva in 1992.