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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

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If it concerns the NV3500 gearbox, it's recommended to use a GM partnumber GM 12345349 (which is claimed to be a 'special gear oil'). If it concerns the NV4500 gearbox, GM's original recommendation is a GL-4 75W-85. Here you could safely use a 75W-90, if you also keep the comment of Gurkha above into account while selecting a product.
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