I just picked up a used, low milage engine for my Heep and I'm planning on putting away for a rainy day. Got a great deal I couldn't pass up but I'm not ready to swap it in just yet. What should I do to it to get it ready for storage besides block off all the openings? Should I drain the oil or leave it in? Remove the plugs? The engine will be stored inside but will be subject to changing temperatures.