Makes dirty with lubricant on board (5)
I believe the answer is:
soils
'makes dirty' is the definition.
('soil' can be a synonym of 'make dirty')
'with lubricant on board' is the wordplay.
'with' is an insertion indicator.
'lubricant' becomes 'oil' (I've seen this in another clue).
'on board' becomes 'ss' (I've seen this in other clues).
'oil' placed within 'ss' is 'SOILS'.
(Other definitions for soils that I've seen before include "Makes dirty" , "Stains" .)