After months of fraught negotiations with the United States, Japan clinched a deal just days before punitive tariffs were scheduled to take effect.

A day after the United States reached a trade deal that imposes a 15 percent tariff on imports from Japan, President Donald Trump declared that U.S. business would “BOOM.” But early reads from auto analysts paint a murkier picture — if anything, some experts say, Japanese companies may benefit more than their rivals for now.

The American Automotive Policy Council, which represents the Detroit 3, criticized a deal giving Japan lower import tariffs than the U.S. automakers.