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Originally Posted by NextGen
From what I have read gas mixture is not an exact science. Many factors can affect the mixture. With that in mind how do you know that the gas you purchase has the right level of cleaner in it? What if it is a little low? If you put a bottle of cleaner in your car periodically then you know for sure the engine is being maintained properly.
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That's the point and you're right. That's why BMW and several other manufacturers banned together to verify and certify those fuels that meet a certain level of performance and detergent content. That is what Top Tier Gas is all about. And like I said before, in addition to that gas, I add a bottle regularly and so I know at least I am doing my best to keep the car running good.