Auctions are hit and miss, my truck was from an auction and it will be my last. Not that their is anything wrong with it, just more than I anticipated for the age and mileage. I got stuck doing the major service and it needs tires, that stuff adds up. Remember the good trade ins are CPO'd on the dealers lot, the not so hot ones go to the auction.

$400 isn't much, not really worth the hassle of trying to sell it yourself. Also $18k seems like a ton of money for an 04 C class, how many miles are on it?

If you really want a clean low mileage C class your local MB dealer is the best place to get one, unless you can find one private. Auctions are really hit and miss.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200