Answer: oil

AnswerCrossword Clue
OILWD-40, essentially
OIL"No blood for ...!"
OILCrude material that starts wars
OILSlick substance
OILOPEC commodity
OILVinaigrette ingredient
OILMasseur's need
OILSlick material
OILOPEC's asset
OILRembrandt's medium
OILVinegar's partner
OILLube
OILDeep-frying need
OILRockefeller's biz
OILWater non-mixer
OILThe "Mona Lisa", e.g.
OILStuff that can gush
OILTanker's cargo
OILTeapot Dome resource
OILSource of Rockefeller's wealth
oilof oil
OILLubricant
OILPeanut product
OILBlack gold
OILTin Man's need
OILWildcatter's quest
OILArtist's medium
OILCooking additive
OILCottonseed product
OILFriction easer
OILIt's burned at midnight
OILLubricate
OILPalm extract
OILPrudhoe Bay product
OILAutomotive essential
OILKind of painting
OILStuff applied to a scalp
OILLube, mostly
OILABUNDANT RUSSIAN RESOURCE THAT ONLY NICE, NON-SANCTIONING NATIONS CAN HAVE
OILEnergy source in drums