Coca-Cola Reformulated Its Drink in 1985 and Surrendered After 79 Days

On 23 April 1985, Coca-Cola CEO Roberto Goizueta walked into a press conference at Lincoln Center in New York and announced that the company was changing its flagship recipe for the first time since 1886. The new formula was sweeter, smoother, closer to Pepsi. The decision was backed by what was at the time the largest taste-test program in the history of consumer marketing — roughly 190,000 sips taken by anonymous panelists, in which the new recipe outperformed both classic Coke and Pepsi. By every internal metric, it was the right move.

The context was a slow erosion. Through the late 1970s and early 1980s, Pepsi's blind taste-test ad campaign — the Pepsi Challenge — had been steadily peeling consumers away. Pepsi's market share kept climbing, and inside Atlanta there was a real fear that Coke would lose its top position by the end of the decade. Goizueta's bet was that a sweeter Coke would close the gap.

The public reaction was immediate and overwhelmingly negative. Coca-Cola's switchboards in Atlanta took up to 8,000 calls a day from angry customers. The company logged about 40,000 complaint letters in the first weeks. Bottlers in the South reported customers buying out cases of old Coke before stocks ran out. Country song lyrics complained about it. A retired Seattle investor named Gay Mullins started a Society to Preserve the Real Thing.

On 11 July 1985, exactly 79 days after the launch, Goizueta and Donald Keough, Coke's president, held another press conference and announced the return of the original formula under the name Coca-Cola Classic. The reformulated drink, now called Coke II, lingered on shelves until quietly discontinued. Coca-Cola's sales surged after the reversal — leaving open the suspicion, never confirmed, that the most expensive marketing fiasco in postwar consumer history had also been the most successful publicity stunt.