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Lacquer – A deposit resulting from the oxidation and polymerization of fuels and lubricants when exposed to high temperatures. Similar to but harder than varnish.
Lard Oil – An animal oil prepared from chilled lard or from the fat of swine.
Lubricant – Any substance interposed between two surfaces in relative motion for the purpose of reducing the friction between them. Less exactly, any substance interposed between two surfaces in relative motion to facilitate their action.
LVI – Low Viscosity Index, typically below 40 VI units.