| I wrench on here, for any aftermarket radiator used I always add some stop leak to the cooling system. Seems radiator quality construction has declined over the years -- this stops minor issues. I realize in the case of our cars certain aftermarket radiators are probably top notch - but just mentioning in case you don't go that route. The stop leak I use is Bar's silver flex stuff - looks like silver metallic paint. Works great - has never caused any issues. PS - Never needed to do this with my Z.
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