Which motorcycle was the first to use Suzuki's oil-cooled SACS engine in production?

The Suzuki GSX-R750 was the first production motorcycle to use Suzuki's oil-cooled SACS engine.

Suzuki introduced the first GSX-R750 in 1985 with the company's Suzuki Advanced Cooling System, commonly called SACS. The system circulated engine oil through galleries and an oil cooler to remove heat from areas around the combustion chambers, reducing reliance on a heavy liquid-cooling system.

The lightweight aluminum-framed GSX-R750 was designed to bring race-bike performance to the road. Its air-and-oil-cooled engine helped keep weight low while supporting strong performance for the period.

SACS later appeared in other Suzuki motorcycles, including larger GSX-R and Bandit models. It is often incorrectly described as purely oil-cooled; the original system combined air cooling with oil circulation and an oil cooler.