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Check the listing for details. Rayg Engine Carbon Removal & Repair Ant – Engine Wear-Protective,. Condition: New. Listed at 19.45 USD. It can imp performance and extend service life. It’s very easy to use: Turn off the engine and let it cool down. Tighten the filler ,start the engine,and let it idle for a few minutes to allow the additive to mix thoroughly with the oil.