The fourth generation Buick LeSabre was introduced for the 1971 model year. The fourth generation LeSabre was larger and heavier than its predecessor, and was available as a coupe, convertible, or sedan. The fourth generation LeSabre was offered with a 3.8L, 5.7L, or 7.5L V8 engine, and was in production until 1976. The fourth generation LeSabre was replaced by the Fifth Generation Buick LeSabre.