The most important consumer of lubricants for automatic transmission and drive systems, the so called automatic transmission fluid (ATFs) are four wheel drive systems. Today, the necessary control elements and sensor systems consisting of electric components such as measuring units and sensors etc. are installed in the vehicles transmissions. Here, the compatibility of these sensible components with the oil e.g. with regard to copper corrosion or at high oil sump temperatures leads to special requirements made on the lubricant and its development. |