Going to look at it in the morning, just seeing if anyone had anything similar. When it's cold, with the shake of the engine, it sounds like an exhaust pipe or something metal is sitting right up against a frame rail. Very similar rattle to a bad strut mount. But it will rattle just sitting in park, so that takes suspension out of it. It's a 13 2.0 auto with 180,000 miles by the way. Any opinions? Forgot the most important point, after 20 minutes of driving, car heats up, rattle goes away.