As other have mentioned, this vehicle has the 3.5 litre engine that has a greater than typical chance of bending a connecting rod. In fact, it could already have a bent rod and the only telltale sign would be excessive oil consumption. The seller (dealer) can honestly claim that he knows nothing about this.

Furthermore, this vehicle is of the W140 series and you must be prepared to spend some serious money in parts to maintain it.

Unless you have just won the lottery, you can't afford to have a dealer or a qualified indy maintain it.