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I've had oil leak through my center intake bolts; never had coolant come through any of them, but for either case either teflon sealer or permatex #3 tacky thread sealant will work fine (the #3 will only dissolve in alcohol, not glycol). But in my case, I just use plain old teflon tape. That works fine too; just be sure to replace it if you pull the bolt out for some reason.
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