I think you'll find that most used oil gets recycled/disposed of fairly quickly. With the progression of the war, it would be more and more important that this is done as soon as possible, so it's extremely doubtful you'll find large reserves of used oil anywhere.
At best scroungers might come up with a few drums of it that were missed by previous visitors.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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