... Hlniversal One oil all the year round Farmers will like this new Shell Oil It saves money. It cuts work. It is much more efficient. Shell Tractor Oil works equally well in diesel, petrol, and vaporising oil engines. V.O. tractors can run twice as long without an oil change. And it is a better oil in every way. It will keep your engines cleaner, and make them last longer. Farmers themselves ...