Mercedes S-class 3D model is available on CGTrader for $129. Original author: squir. Specs: 350000 polys, 390000 verts.
MAX (Autodesk 3ds Max, filesize: 8.64 MB), OBJ (OBJ, filesize: 28.6 MB), FBX (Autodesk FBX, filesize: 14 MB), C4D (Cinema 4D, filesize: 7.04 MB), LWO (Lightwave, filesize: 6.66 MB), 3DS (3D Studio, filesize: 5.42 MB)