Crossword Genius

Diffuser fills (4)

Ross

I believe the answer is:

oils

(Other definitions for oils that I've seen before include "Viscous substances kept in silo" , "Viscous stuffs in silo" , "landscapes, perhaps" , "Lubricants stored in silo" , "Liquids for frying" .)

I've seen this clue in The Wall Street Journal.
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