Oil is stored here, and upgrading these allows for a larger storage capacity. These are highly explosive upon destruction and should be caged in walls to reduce damage to other buildings.
Level 1 | Level 2 | Level 3 | Level 4 | |||
Level 5 | Level 6 | Level 7 | Level 8 | |||
Level 9 | Level 10 | Level 11 |
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