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Would you say best practice is to use fuel from stations with their own refineries? (Shell, Exxon, Chevron, etc) and would Seafoam be a good enough choice for Fuel System Cleaning, or would Red Line or Techron be better?

Hello guys, My dad has always looked at this forum for answers on oils and things. And, in 2021, we switched cars. I had a 2014 Mazda 2 that I did basic maintenance to, and didn't really care much about what Oil I put in it as long as it was 0W-20 as per the car's recommendations. And then he...