This week on The Best of Car Talk, even with one infant on hand and twins on the way, Mara and her husband need a new car, but would rather drive a horse and buggy than a minivan. Will Tom and Ray send them to a dealership, or a stable? Elsewhere, Christine and her mom’s cars are sending each other smoke signals from under the hood; Burt is hoping his oil leak replacement plan means he never has to do an oil change; and how should Mario take care of his Mercedes in Italy during the 10 months of the year he spends in Alaska? And, shouldn’t his calendar be the other way around? All this and more, this week on The Best of Car Talk.