After quite a few sour experiences - even from Sams club a few times I have resorted to use large truck stops to fill fuel. The regular fuel stop for me is a Flying J about 55 miles from my house.

They sell a bright yellow diesel fuel which says its B20, Nearly all other places diesel fuel has a green tinge and says anything from B5 to B20.

The last Chevron run by "Joe Habeeb" I got diesel from had fuel that had black stuff floating in it (I found this after I had to siphon it out from the tank because the car was running extemely poor).

This flying J fuel gives me an exhaust smell like the Big Renault or MAN trucks do in EU, a strong burnt coal smell but the truckies usually dont like me filling up from the big nozzles.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)