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NO additives are recommended by any good mechanics. Only the full repair is best especially whem dealing with coolant leaks. Usually intake leaks are from years of corrosion the coolant will turn to acid in most oif todays cars if not treated you will have much internal damage. the external leaks will only show up when damage is done. Dont write off the vehicle it ,will be much cheaper to repair than pay the extra cost for insurance ,interest loss of value for new cars.....

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Q: Will a stop leak fix a antifreeze leak by the intake manifold?
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