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4WD Differential Oil
How Often Should You Change Your Differential Oil?
How often should you really change your differential oil? The answer isn't simply a number on the odometer. Discover how towing, heat, off-road driving, water crossings, motorsport and workload cha...
4WD Gear Oil
Why Does Gear Oil Get So Hot?
Your differential doesn't need to be broken to be cooking its oil. Discover where gear-oil heat comes from, how friction, sliding contact, load and towing affect lubricant life, and why the right f...
4WD Gear Oil
What Happens Inside a Differential Under Load?
What's really happening inside your differential when you're towing, racing or working it hard? Explore hypoid gears, sliding contact, heat, shock loading and EP chemistry — and why the right gear ...
4WD Differential Oil
Your Gear Oil Doesn't Last Forever
Gear oil doesn't suddenly fail the day a differential starts making noise. Discover how heat, load, oxidation, contamination and hard use gradually affect your lubricant — and why regular different...
85W-140 Gear Oil
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.
4WD Differential Oil
Differential Oil: Why It Matters More Than You Think
Your engine oil gets plenty of attention. Your differential oil? Not so much. But behind the scenes, that oil is protecting gears and bearings from heat, pressure and load every time you drive. Fro...
