That just means you run the engine, take the car for a good drive for an hour so such that everything has been fully warmed up. You can re-torque the next day. The important thing is that the engine has been warm so the gasket will have minutely shrunk and remain thinner, thus you can re-torque. You can ask Mercedes if it they are stretch bolts or not, they should know! If not I'm sure someone on here knows!!!