When I was in California about a year ago, I just gave my car to someone else to drive. In this case, he also fixed up a few annoying minor problems I had with my car. Over a period of time, the suspension on a 6.9 will drop, even when new. To this end, Mercedes shipped them ex factory with the rubber suspension blocks in place, whereupon the were removed by the selling dealer, and retained by the customer, should they need them in the future. I have seen such rubber blocks removed from current new cars, such as Nissan sports models, with non hydraulic suspensions. As far as fuel is concerned, it deteriorates over some months, and causes a variety of problems, when the car is subsequently driven. A simple technical phone call to any of the major oil companies will answer your queries; they are quite happy to help in this regard, when you get onto the right person.
