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Truck Gear Oil HC GL4 75W-80 is a high-performance, high-pressure gear oil for heavy-duty manual transmissions with and without retarders or intarders as well as auxiliary transmissions. High-quality base oils based on HC synthesis technology and modern additive technology ensure a wide variety of applications and optimal transmission lubrication under extreme conditions as well as long oil change intervals of up to 320,000 km. Thanks to its smooth running characteristics, this gear oil can also be used in the event of shifting difficulties (e.g. sluggishness) experienced when problems occur with e.g. higher viscosity/monograde oils of the API GL 4 class.