Crossword puzzle clue "petroleum residue"

Here are the possible solutions for petroleum residue clue

Answer
Clue
Relevancy
coke
Clue
Petroleum residue
Definition
to change into a carbon fuel
tar
Clue
Petroleum residue
amoco
Clue
Petroleum giant
Big name in petroleum
Petroleum company
1998 British Petroleum acquisition
It merged with British Petroleum in '98
British Petroleum merger partner

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