Crossword Genius

Oil from car black until changed (9)

Ross

I believe the answer is:

lubricant

'oil' is the definition.
(I've seen this before)

'car black until changed' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'changed' indicates anagramming the letters.
'car'+'b'+'until'='carbuntil'
'carbuntil' is an anagram of 'LUBRICANT'.

'from' acts as a link.

(Other definitions for lubricant that I've seen before include "it has a smoothing effect" , "Oil or grease" , "What might have you well oiled" , "Substance used to reduce friction" , "Oil, for example" .)

I've seen this clue in The Sun.
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