What is heavy oil used for?

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Tags

1. #contaminants
2. #heavy
3. #lighter
4. #process
5. #residual
6. #treatment
7. #refining
8. #cheaper
9. #makes
10. #reason
11. #containing
12. #marine
13. #removed
14. #fuels
15. #before
16. #other
17. #crude
18. #product
19. #engines