The need for different oils in different systems of the modern United States tractor has complicated servicing and maintenance by the farmer. In Europe this disadvantage has been somewhat overcome by multiviscosity oils suitable for all-season use and by the wide acceptance of a “universal” oil. Those countries that import tractors from both Europe and the United States encounter conflicting requirements. This paper suggests that if United States manufacturers develop a similar “universal” oil for the newer design tractors and adopt sealed-for-life units in their tractors, such improvements will greatly simplify the farmer's maintenance problems.
