If you're a DIY enthusiast, greasing your trailer or RV axle is a standard afternoon task. Here is the basic workflow: How to Grease a Trailer Axle - Lippert

These require specialized CV axle grease (often NLGI No. 1.5 or 2) that can handle the extreme angles and rapid rotation of front-wheel-drive cars.

Friction generates intense heat that can literally weld parts together.

At its simplest, axle grease is a thick, heavy lubricant designed to reduce friction between moving parts in your vehicle's axle assembly. Unlike engine oil, which is thin and flows freely, grease is "viscous"—it's designed to stay exactly where you put it, even under extreme pressure and heat.

Grease acts as a seal, shielding delicate bearings from road salt, dirt, and water.

Tractors and loaders often have specific "grease points" (zerk fittings) that require heavy-duty polyurea or lithium complex grease to handle rugged terrain. Maintenance 101: How to Grease Your Axle

Not all grease is created equal. Depending on what you drive, you’ll need a specific type: