Thanks to their sophisticated technology and sturdy construction, STIHL chainsaws require very little care and maintenance. During the season, this is likely to be confined to checking the chain regularly and keeping the cutting links sharp for a better cut and to protect the engine.
 
Here are a few tips for storing your equipment during the winter months. This will ensure that your equipment, when required again, will be ready for action right away.

1. To get the equipment ready for winter, clean it first. The air filter, the cylinder fins, the spark plug and the dismantled cutting tool should be checked and cleaned (also see Operating Manual). Metal parts should be just slightly lubricated with oil.

2. The fuel tank should be emptied. Run the carburetor until dry (Warning! Do not operate the throttle; run equipment in idle until the engine stops!)

For winter storage, a dry and, if possible, dust-free and frost-free place would be ideal. You can save space if you hang the equipment. And remember: the fuel mix deteriorates; to avoid malfunction, it should not be kept over a long period of time.

Source: http://en.stihl.ca/how-to-care-for-and-store-your-equipment.aspx