Engine's oil store (4)
I believe the answer is:
sump
(Other definitions for sump that I've seen before include "Into which liquids drain" , "Water collector" , "Reservoir for oil etc" , "It receives the engine oil" , "oil well?" .)
I believe the answer is:
sump
(Other definitions for sump that I've seen before include "Into which liquids drain" , "Water collector" , "Reservoir for oil etc" , "It receives the engine oil" , "oil well?" .)