class Mercedes (likely  a 450 SEL or a turbodiesel variant of the same body style). However,  in the next shot, the car shown is the same color, but very clearly  a 300 class (300 Diesel or 300 Turbodiesel) model. The latter is  used in all interior and exterior shots throughout the Autumn (at  the Connecticut inn) and eventually sinks on thin ice in "Winter."