not sure about wagons but dont see why not . bio diesels just a posh name for putting vegetable oil in with diesel . i have a pajero and when i got it ,it was running 50/50 diesel veg oil .i know people that run 100 % veg oil in the summer . the only problem is starting the engine when the weathers cold . you can now buy a heater to warm the oil so it starts in winter as well.my car run much better on veg oil .but the price of veg oil has right up since this was made legal .a litre of smart price veg oil from asda used to cost 37 p now its 98 and most shops have a limit on how many you can buy