After I Buy Chevron 65740 Techron Concentrate Plus Fuel System Cleaner - 20 oz.I saw a marked improvement in performance and sluggishness, for my vehicle, post applying this product. If you've never used it and have high mileage, 2 applications are required. Also, it's important to first pour this and THEN the fuel. Ensure your tank's at least 18 gallon, if you're using the 20 oz. or else go for the 12 oz. bottle. I would not recommend any additives but this and Tufoil. These are really good and most importantly, don't cause any harm to the engine.
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