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2013 XTS
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You don't necessarily have to use them but if you already bought them. Ranger can attest to that he is the god in the seville forums and if he didn't use them I would have felt safe not using them. I crushed up three of the gm big ones and dumped the powder into the first bottle of antifreeze I poured in. Otherwise put them in the lower radiator hose.
 
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