Say I'm shilling for exxon mobil, should I be buying my petrol at an Exxon or Mobil gas station? And what if I want to buy some snake oil additives, like upper cylinder lubricant, Mobil doesn't make one, so I have to buy Lucas making me feel guilty. Maybe I don't need to buy any cause this stuff already gots it? Anyway I'm sure the gasoline comes from the same pump, delivered with the same truck network, so maybe it doesn't matter? Oh well, my car engine ain't explode so I guess I'll keep using it. Anyway, back to the original question, Exxon or Mobil? Or just whichever one is closest?