I was referring to the #6 bolts: they bolt into the exhaust manifold which is cast iron. I said before they are made of high carbon steel which is probably incorrect since they are not magnetic. In either case I've put the antiseize compound on them because as I was turning them I noticed they were seizing very easily. I was going to put some grease on them, but the being exhaust it would have burnt off right away.

About the oil separator I'll update that thread next so we keep this conversation on topic.

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