The car sounds like an old diesel car when it starts. Its also very loud and almost always a very large rev from the engine after starting. The car has 100K on it now but was consuming also of oil before then when we took it in the finally said oh we have to rebuild the entire bottom end. That still didnt fix this rattling issue. Has anyone come up with a solution for this issue? The warranty on the rebuild is good for a year so Lawrence Chevrolet has to fix it but they "never seem to find anything"