Crossword puzzle clue "substance in an engine"

Here are the possible solutions for substance in an engine clue

Answer
Clue
Relevancy
oil
Clue
Substance in an engine
Definition
to lubricate with a greasy substance
abrasive
Clue
Substance used for polishing
Grainy polishing substance
Definition
capable of grinding away another material
abuser
Clue
Substance overdoer
Definition
one who abuses
acid
Clue
Caustic substance
Corrosive substance
Low-pH substance
Sour substance
Definition
sharp, sour

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