Sorry old memory isn't what it was, but I think there was a Lycoming SB warning of internal corrosion on low utilisation engines. We once found severe corrosion on an O-360 camshaft about the time of a fatal accident caused by a broken corroded camshaft. I don't think I encountered milky oil in any of our engines despite Ireland's maritime and humid climate, In my ancient Ford it was a blown head gasket ... yet again
