When servicing a limited slip differential, which lubricant should be used?

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Lubricant specifications for a limited-slip differential must match what the manufacturer recommends because these units rely on a precise balance of viscosity and friction modifiers to let the clutch or locking mechanism engage correctly and smoothly. The OEM-recommended fluid is formulated specifically for that differential’s materials, seals, and clutch pack or mechanism, ensuring proper operation across temperature, effective heat transfer, and long-term wear protection. Using that exact fluid helps maintain performance and protects warranty coverage. Other fluids don’t provide the same viscosity, additives, or compatibility, so they can cause improper engagement or wear, and in the cases of water or gasoline, would cause immediate damage. Automatic transmission fluid isn’t appropriate for most limited-slip differentials unless the manufacturer specifies it, so it’s not the right choice here.