I've tried many ways to source a used Mercedes over the years and honestly the only way to not get scammed is to go where the sellers are actually held accountable. I'm always super cautious about where my money goes, so I mostly stick to auction sites like Bring a Trailer or Cars and Bids lately. The reason why is the comment section... if a seller is lying about the condition, the enthusiasts there will spot it in two seconds. It’s way safer than some random dealer lot in Chicago where they just detail it and hope you dont look underneath. Heres my routine for making sure the car is actually reliable:

• Demand a cold start video if you're buying remotely to hear the timing chain.
• Look for cars with a documented history on the Mercedes VMI (Vehicle Master Inquiry) report if possible.
• Always bring your own tech to the viewing. I never leave home without my iCarsoft MB V3.0 for Mercedes-Benz OBDII Diagnostic Tool because it catches the manufacturer-specific codes that generic readers miss. In my experience, spending a little extra on a flight to see a car in a dry state like Arizona or Texas is way better than buying a rust bucket locally in the salt belt. If you find a clean E400, just be prepared to walk away if the seller acts weird about a PPI. If they wont let a pro look at it, there is always a reason and its usually expensive...

Honestly, I feel your pain. I spent months looking for my current ride and found that the big generic sites are just full of junk lately. I ended up having a really good experience using enthusiast-specific spots instead of just hitting up Craigslist. Here is what worked for me:

• MBWorld Forums. Check the marketplace section there. Most owners are enthusiasts who actually keep service records.
• Bring a Trailer. It can be pricey but the community comments usually call out any red flags or hidden issues.
• Cars and Bids. Really good for newer stuff like the E-Class. I finally snagged my Mercedes-Benz E400 4MATIC Coupe 2017 for just under 27k and i am super satisfied with it. I also brought a Autel MaxiCOM MK808S OBD2 Scanner to every viewing to check for hidden codes... it basically saved me from a bad airmatic pump once. Just stick to the forums and youll find a clean one soon enough, keep at it.

Regarding what #1 said about "Honestly, I feel your pain. I spent months..." - it really is a mess out there. I stumbled on this today and totally agree that the big sites are basically landmines now. If you're hunting a clean E400 around Chicago, skip the FB Marketplace headache and look at Cars and Bids or even Bring a Trailer. The listings are way more detailed and sellers usually get roasted in the comments if they try to hide anything. Since you know your way around an Airmatic system, you should definitely bring a iCarsoft MB V3.0 for Mercedes-Benz when you go to see a car. It pulls dealer-level codes that generic scanners miss. Also, since dealers love hiding bodywork, I never leave home without my Extech CG204 Coating Thickness Tester. It's saved me from buying "pristine" cars that were actually half-filled with Bondo. 25k is a lot to gamble on someones word.