The American poet Robert Frost once wrote: “In three words I can sum up everything I’ve learned about life: it goes on.” Frankly, I can’t think of a better tagline for the Mercedes-Benz W123, either. It really does go on. And on. And on. We’re written a lot about these iconic Mercedes sedans, coupes and estates, but these cars have a timeless appeal backed up by frugal engines. This final year 300CD coupe has the 3.0 liter turbocharged inline-5 diesel under the hood. It might not be a terribly fast car, but it blends economy with a level of class you just can’t match in most modern cars. This particular car for sale in Arizona is a one-owner example with a low 64,500 miles on the clock.
