Answer:

oil

Answer	Crossword Clue
OIL	Lubricate
OIL	Peanut product
OIL	Black gold

OIL	Tin Man's need
OIL	Wildcatter's quest
OIL	Artist's medium
OIL	Cooking additive
OIL	Cottonseed product
OIL	Friction easer
OIL	It's burned at midnight
OIL	Lubricant

OIL	Palm extract
OIL	Prudhoe Bay product
OIL	Automotive essential
OIL	Kind of painting
OIL	Stuff applied to a scalp
OIL	Lube, mostly
OIL	ABUNDANT RUSSIAN RESOURCE THAT ONLY NICE, NON-SANCTIONING NATIONS CAN HAVE
OIL	Energy source in drums

OIL	Grape seed product
OIL	Lube
OIL	"No blood for ...!"
OIL	Crude material that starts wars
OIL	Slick substance
OIL	OPEC commodity
OIL	Vinaigrette ingredient
OIL	Masseur's need

OIL	Slick material
OIL	OPEC's asset
OIL	Rembrandt's medium
OIL	Vinegar's partner
OIL	WD-40, essentially
OIL	Deep-frying need
OIL	Rockefeller's biz
OIL	Water non-mixer

OIL	The "Mona Lisa", e.g.
OIL	Stuff that can gush
OIL	Tanker's cargo
OIL	Teapot Dome resource
OIL	Source of Rockefeller's wealth