GM has unwrapped the new SLS 2.0T SIDI at the 2010 Guangzhou motor show. While the car hasn’t changes cosmetically, it sports a new petrol engine. A Cadillac and large executive sedan first, the 2.0 litre turbocharged petrol engine SIDI signs the first usage of a turbocharged four-cylinder in a Cadillac. This engine gives Cadillac a workable competitor into the Chinese premium large sedan market,