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Question about the oil cooler lines on an O-290G: Should the fittings screwed into the [aluminum] accessory case be aluminum or steel? I know there are issues with aluminum on aluminum threads galling, but the are the standard aluminum fittings (e.g. AN823) are anodized, is that acceptable or do I need to use steel fittings? The incorrect type fitting I'm replacing was steel, the flare nuts on the hose assembly are blue so I assume they too are anodized aluminum.