Efficient high-pressure transmission oil for use in manual transmissions under heavy loads with and without retarders or intarders, plus auxiliary transmissions. The high-quality basic oils based on HC synthesis technology and modern additive technology ensure a wide range of applications and optimal transmission lubrication under extreme conditions and at long oil change intervals up to 320,000 km. Thanks to its low-friction characteristics, this oil can also be used in the event of transmission problems e.g. stiff gear change where high-viscosity/single-grade API GL4 oils are used, for example.