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to buy gas, do not fill up; most likely dirt and sludge in the tank is

...e [[detergent]] additives to help keep the engine clean and minimize [[oil sludge]] buildup. ...uces some microscopic metallic particles from the wearing of the surfaces. Sludge also accumulates in the engine. Such particles could circulate in the oil a

...ody corrosion and, sometimes, blocked radiators due to deposition of metal sludge. Care should be taken when changing acid as acid can have a negative effect