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"The situation is a total collapse.", Russian car mechanic warns of a fuel contamination crisis.
(files.catbox.moe)
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Believe it or not, there are bacteria that live on surface of fuels and oxidize them for energy. Sometimes there are antibacterial additives, sometimes they are filtered off, but sometimes these just fall down to the bottom of storage barrel at gas station. This, mixed with rust and a little of water, forms that sludge. They see that because gas station runs out of fuel