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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?

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?

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Yes of course, gasoline is a solvent, and it sprays on top of the cylinders, therefore only carbon can accumulate. This is particularly bad on direct injection cars, which is why they started using both port and direct injection. Lubricating the combustion chamber with a solvent that dissolves carbon and sticks can helps because that is the one part of the engine that has the least lubrication. Gasoline is a solvent after all.