New car

[Niceguysi05]

So I'm looking at a mercedes c180k SE coupe 2005 on Saturday in silver fsh, leather 80k what to look for? In the pictures can not see any rust?

 

[slade1]

An 05 MB should have no major rust, try google for more information

 

[AMGeed]

That model has the infamous M271 engine.
Be ready for worn timing gear, most noticable on cold starts and oil leaking from the cam sensor magnets at the front of the engine. The oil wicks down the wiring and eventually into the ECU where its an expensive job to fix with new loom required. Check for those oil leaks around the two circular magnets either side of the thermostat in the photo below. Pop the plugs off and check for oil inside the plugs.
If the engine rattles for a couple of seconds after a cold start, walk away. It indicates worn timing gear, possible stretched timing chain and an expensive fix.
Good luck with the viewing and hopefully none of the issues I've mentioned are apparent.
Not trying to deter you, just make you aware.

 

[MrGreedy]

I would be a little more cautious about the rust.

Major areas are around the wheel arches, subframe where suspension arms connect, suspension arms, and not practical for viewing, but behind the front wheel arch liners in my experience.