Raluhio,
Your brother left out a little in his argument. He failed to take into account the repair and maintaince cost for years 5 - 10. Volvos are not what they used to be. A friend of mine has a S60 with about 80K miles and has spent a lot more on it than I have spent on my old 84 500 SEL with about 250K miles in the last 2 or so years. And I had rather have my 84. It drives better, is quieter, has more power, and gets almost as good mileage on the road.
Let your brother have his Volvo, you keep your Benz and 10 years from now see who has the best car.
Like I said earler, people buy new cars because they want a new car.

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84 500 SEL (307,xxx miles)