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What Makes a Good Gear Oil?

85W-140 is only the starting point. Discover what really makes a gear oil work, from viscosity and EP chemistry to base oils, Limited Slip compatibility and severe-duty protection.

Customer Satisfaction Guarantee

A Noticeable reduction in wear or we will give you $100 store credit! We are that confident in our products, KCK Lubricants Guarantees a noticeable reduction in wear when using any of our oil products, if you are not satisfied we will give you a store credit of $100

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What Makes a Good Gear Oil?

Customer Satisfaction Guarantee

What Makes a Good Gear Oil?

Differential Oil: Why It Matters More Than You Think

Why We Refuse to Build Cheap Oil