Gray, is a rare color for sure, but will show a lot of wear if he didn't take care of it. inner cooler pumps go bad and most think the car has serious mechanical problems. many here have benefited from knowing this and buying their cars under market value. Mileage is nothing on the benz motor, especially a hand built AMG motor. Moister getting into the trunk from the leaking spoiler mounts can cause havoc with the electricals in there, so make sure door locks work with the remotes and such. Sticky ignition key, RCM module can cause a starting/no start problem as well. ALL easy fixes with how to's on here...... Good luck...if you pass, I have a '99 Tahoe in great shape I would trade him with $$$$$ LOL.