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Just had two stupid thoughts:
Do the countries you go through use dyed fuels like East Germany used to? It could account for some differences in the color of the fuel filter deposits.
One of the reasons our filters might look a lot cleaner if the long term used of 5-10% ethanol. If the tank started clean, Ethanol dissolves about anything organic (it is a solvent) so the only deposits on the filter would be inorganic (rust mostly).
I still think you are super stressing over non-issues but that is OK.
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