Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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If it's a CPO, there should be no mechanical issues. Besides, it's still under factory warranty. The dealer can check the maintenance schedule by computer if the car has been maintained at a dealership. Ask the dealer to check all recalls and technical notices for the car and make sure everything has been done to this one. The only maintenance issue that may have slipped through the cracks is changing the cabin filters. Unless the original owner is meticulous, the cabin filters have probably not been replaced, and it's a good idea to replace them every 20k or so, depending on dust and pollution issues in your area.
CPOs are pretty safe buys from a mechanical perspective.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck