Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Probably not. The additional seating is a pad, bolster, seat belts and carpeting added to the storage bin in the parcel area, not any kind of dramatic revision of the vehicle or its configuration. I believe you can actually convert a 5-seat to a 7-seat relatively easily. Your use of "estate" rather than "station wagon" or "wagon" indicates you are not in the US. I am referring to the vehicle in the US (most estates in this country came as 7-seat versions, I believe). I can't speak to added value elsewhere. My answer would be the same were I to suppose for the same reasons.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck