This is three pages of hints, suggestions on how to keep your BMW in good condition. Be sure to read the text that I posted just above the last page below.
Below is a good tip for long storage periods. However, the most important thing to do isn’t mentioned. One should always rotate the engine to TDC (top dead center) as that will prevent rust in the cylinder wall below the rings. This happens when the storage area heats up and cools down. The air, laden with moisture gets into the combustion chamber. It is drawn into the carbon deposits on the piston top and on the surface of the combustion chamber. These deposits then flake off and fall to the bottom of the cylinder. They are full of water and will rust the cylinder. If the piston is at TDC, the rusted area is above the rings.
If the piston is in the position where it last stopped when the engine was shut off, it is mid-way in its travel in the cylinder. The rust will be in the area where the rings must pass. Compression will be compromised and it will burn oil.