Truck Grease
The video is a grease gun on a truck. Highway trucks, waste trucks, and delivery trucks carry dozens of fittings. Spring pins, kingpins, tie rods, brake slack adjusters, driveshaft universal joints, and the fifth wheel all move under load and weather. Grease is what stays there after oil would drip off. The work in the clip is ordinary chassis lubrication, done on an interval, not a repair of a failed bearing.
Most of those fittings take an NLGI 2 grease with a lithium or lithium-complex thickener. Complex grease is the one that holds up when a brake or a fifth wheel runs hot. A moly or extreme-pressure additive shows up on equipment that slides or shocks, such as a fifth wheel or a bucket pin. The truck maker's book names the grease and the miles. A darker color or a famous brand does not override that book. Red dye does not mean high temperature. The thickener and the dropping point do.
Pump until clean grease appears at the seal or the purge hole, then stop. A fitting that will not take grease is blocked, painted over, or damaged. Forcing the gun blows the seal and leaves the contact dry. A sealed hub or a sealed universal joint with no fitting is not a missed spot. Those parts are greased for life at the factory. Adding a hole to grease them lets dirt in. Wipe the fitting before you couple the gun so grit is not the first thing you pump into the joint.
Do not use kitchen grease, yellow grease, or choice white grease on a truck. Those are rendered fats and used cooking oil. They are not lubricating greases, they have no NLGI grade for a chassis fitting, and they oxidize and wash out. Do not use silicone O-ring grease on a kingpin. Silicone grease is for rubber. The chassis wants a soap-thickened oil that can carry the load.
Water is the other enemy. A truck that is washed every night needs a grease with real water resistance, not just a tacky string on the finger. Calcium sulfonate and some lithium-complex formulas are chosen for that. Read the water-washout number. If the fleet parks outdoors, salt and rain matter as much as mileage.
GREASE.ORG's lubricating-grease pages explain lithium, synthetic, and multipurpose products in more detail. This page is the truck end of that subject. One gun, one grease, a clean fitting, and the interval in the manual. The video is the motion. The specification is still the label on the cartridge.
