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Techron by Chevron
Put a bottle of Techron in your tank twice a year. Your fuel system will stay clean and avoid injector issues. It does NOT, however, clean the valve deposits on a direct injection engine. But it will clean the top of the pistons and other parts of the exhaust track. I have used this religiously since 1985 and have never had a fuel system issue on any of my cars. BMW sells it under their own name, but you can buy in bulk packs at Costco.
A great product IMHO.
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