2012 Cruze Eco
Found my newly installed new thermostat housing leaking. I had assumed it was due to the fact that I tried using a gasket sealant with the rubber gasket when I put it together, but upon closer inspection I'm wondering if it's because of these bumps in the gasket trough. Looks like a bad casting from the factory maybe? See image. Anyway, what do you all use on your gaskets? Nothing? High temp silicone?