Ultra Large Crude Carrier (ULCC) - see supertanker
ultraviolet absorbance
undisturbed penetration - see penetration (grease)
United States Geological Survey - see USGS
United States Pharmacopoeia - see USP
unleaded gasoline
unsaturated hydrocarbon
unsulfonated residue (USR or R)
unworked penetration - see penetration (grease)
USDA H-1/H-2 lubricants - see H-1/H-2 lubricants
USGS (United States Geological Survey)
USP (United States Pharmacopoeia)
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