[Jamesp]

The rattling noise you heard may well have been the connecting rods slamming into the crank due to high compression due to oil in the combustion chambers. As you don't do your own wrenching take it to a mechanic on a flatbed. You can easily reduce your engine to scrap if it is ingesting oil due to the piston attempting to compress in-compressible oil. Something will give and it wont be the oil.