Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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If you're concerned about repair costs, an extended warranty is something to consider. There are plenty of companies that will write one on a car as young as yours that will take it out to 100k miles. It will cost a bit because you have an AMG version with all the good and bad that implies, but it will keep you from losing sleep.
I suggest you read the manual and spend time in the appropriate forum for your car. Newer MRZ, particularly AMG/Supercharged versions are very well engineered, but they are also very complex. Changing the oil every now and again and expecting trouble-free driving from that won't do. In my experience with my W220, careful attention to the maintenance schedule will save you some breathtaking repair bills.
Enjoy your ride! You've got yourself a real Q-ship; it's blindingly fast, corners like a go-kart, stops right now, and looks like your Dad's business ride--except for that little "supercharged" medallion on the side.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck