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I have very little car knowledge so this is not me doubting you, this is just me trying to understand... But my understanding was that the move to direct injection is what pushed manufacturers to push for the Top Tier standard... Ie my understanding was not that additives only worked if you had...

Over the last two weeks, I think I’ve read about every forum post on fuel additives in existence. Yet, I’ve never seen a question or an answer that addresses one specific aspect. All of the reputable fuel additives (or at least the ones that everyone seems to use) seem to be meant for periodic...