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Knowledge Center Rail Gearbox Lubricant Enhances Cold-Weather Operation Klübersynth LEG 4 75 W 90 is a high-performance gear oil for rail vehicle gear boxes designed to operate under high loads at low temperatures.

Klüber Lubrication, a worldwide manufacturer of specialty lubricants, introduces Klübersynth LEG 4 75 W 90, a synthetic high-performance gear oil for rail vehicle gearboxes.

Even in the cold, trains need to run smoothly. These vehicle gearboxes often operate under high loads. The new polyalphaolefin-based oil technology of Klübersynth LEG 4 75 W 90 provides a wide service temperature range, including excellent low-temperature characteristics. Compared to conventional synthetic gear oils, its VI (viscosity index) enables a higher viscosity at lower temperatures.

Additionally, the good shear stability of Klubersynth LEG 4 75 W 90 prevents a decrease of the lubricant film thickness, even during long-term operation at high loads. The high micro pitting resistance protects gearboxes operating under high loads that are susceptible to this damage. Through its low foaming tendency and anticorrosive properties, problem-free gear operation is made possible.

The high scuffing load capacity enables this gear oil to be used in gearboxes that require API GL-4 or API Gl-5. Its excellent wear protection of both gears and rolling bearings extends the life of lubricated components. The excellent aging and oxidation stability permit longer oil change intervals compared to mineral or other synthetic oils. Both of these characteristics reduce maintenance costs.

For maximum benefit, especially for the low-temperature range, Klübersynth LEG 4 75 W 90 can be paired with Klübersynth GE 4 75 W 90.

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