Date registered: Jan 2009
Vehicle: 1977 230, 1990 300E 2.6
Location: Eastern Panhandle, WV
Mentioned: 0 Post(s)
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For short term storage, there is little deterioration of gas. If it will make you feel better, add some Stabil or Sea Foam to the tank just BEFORE (to mix it w/gas as you fill) the last fill. Then drive it long enough to pull the treated gas through the system.
Frequent starting but not driving, is harmful to the engine, as stated in a post above. You need several miles of driving to burn off the moisture, etc. from a cold start. There is, however, some debate as to whether this is as much of a problem with the fuel injected, leaner running engines - as opposed to carbureted engines.
It is better to leave a window or two slightly open during storage as this will prevent buildup of moisture inside the car during weather/humidity changes. The moisture can cause mold on upholstery, etc. as well as corrosion on internal chrome trim parts and rust on things like seat springs.
A brake fluid flush every 2 years will keep the internals of that system in good condition. BTW, your brake hoses are now 20 years old, time to consider changing them. The rubber used for O.E. Mercedes hoses seems to be pretty durable but the rubber can also deteriorate internally, causing braking problems.