can be tigged up if its removed from the engine obviously.. but if its on the car, i would clean the shit out of it with brake cleaner (or fuel, anything that evaporates without leaving residue), and use aliminium devcon
ive used it for transmission coolers on bmws as there a little aluminium can type looking thing that clips into the radiator and has water running through it, people bump kerbs or a decent rock flicks up and they weep oil... never had one come back
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