Dejo

I just sold my BMW M3 and I noticed that while im driving the engine temperature is low around the 1/4 mark at the bottom, or close to middle about 3 dashes below. But when I get to a stop light it climbs up to 1/2 and doesnt go above that. Is it just me or is that a Thermostat problem or its just how lexuses are. It doesnt over heat and doesnt go below 1/4th, should I be worried. P.S its a great car, just hit 154000 and it just started its life.