The Sepang 12 Hours (formerly known as the Malaysia Merdeka Endurance Race and Merdeka Millennium Endurance Race), is a 12 Hours endurance racing event held annually since 2000 at the Sepang International Circuit on December in Malaysia.
It is organised by the Stephane Ratel Organisation, responsible for global GT3 standards in international sportscar racing, as of 2015. The scheduled date is December 8-11, 2016.
Historically part of the Merdeka holiday, the race was moved to December by Ratel to make the race as the first of four major endurance races held in the Northern Hemisphere winter, the traditional off-season of motorsport, with the others the Dubai 24 Hour (Creventic 24H Series) and the Rolex 24 at Daytona (IMSA WeatherTech SportsCar Championship in January, and the Liqui-Moly Bathurst 12 Hour in February are the others.
In the late 1990s, Malaysian auto manufacturer Proton used to organize a 300 km race at Shah Alam circuit for local racers racing with Protons, to celebrate Merdeka in Malaysia. When Sepang International Circuit was built the race was shifted to the F1 circuit, with the winners of the race entitled to a new Proton road car.
But after the 1999 race, a dispute happened between Proton and Sepang International Circuit, resulting in Proton's sponsorship withdrawal. Sepang therefore decided to host a replacement race by itself and started the Merdeka Millennium 12 Hours Endurance Race in 2000. The race also opened up for non-Proton entries.
The inaugural race was won by the Proton EON Racing Team (PERT) with Jimmy Low, Karamjit Singh and Tommy Lee driving, beating off the challenge from TVR Racing who ran Malaysian F1 driver Alex Yoong.
In 2001, TVR Racing won the race with Jeffery Wong, Tommy Lee and Admi Shahrul in a TVR Chimaera.
In 2002, Amprex Motorsport entered the Japan GT300 spec Mazda RX-7 machine, with crack Hong Kong driver Charles Kwan and Kevin Wong as its drivers. But the car failed to finish the race. Nigel Albon, Tommy Lee and T. Hamman won in their Porsche 911 GT3.