We are driving a 97 Dodge 6cyl Caravan with 160,000 mileson it.It still runs strong but we are thinking of getting a brand new vehicle within the next year.I see a lot of 4 cylinders in the paper.To put it bluntly."Are they any good"? Do they burn out ear;ier than 6s? Whats a good company? Are Dodges any good? Are 4s available in vans like the Caravan?