New to MBZ. Talk about an E420?

[serviceguy]

Hi all - I was perusing and found your forums and decided to join to get some honest opinions.

I was looking for a used car as a spare and stumbled across a 1994 E420 for what I think is a pretty good deal, but it has considerably high miles.

My question to you is this - This car has 165K on it right now, how long are they good for? If it was a Honda i wouldn't think twice, just buy it. A chevy or ford, wouldn't even give it a look. But everyone I've ever known who owns MBZ absolutely loves them and I like the idea of having one. I personally have seen them with 300K on them but they were smaller engines.

A few things about the car - It seems kind of dirty. I originally thought bad stains, but after looking around, I realized the car had not been detailed at all. I think it would clean up nicely.
It runs very smooth, drives really nice (I drive a Yukon Denali everyday. I have a hard time saying a car rides nice. I returned a Caddilac because of ride quality issues. I could live with this one.) I did notice a sound like almost a warped rotor sound on light braking, but no feeling of warpage. Everything appears to work inside the car. Hood ornament is missing. I can't tell if the AC is working or not, and after reading around in this forum, that might end up to be a condition of sale.

The asking price is well below book in my area, considering the mileage. I will use this car as a highway driver mostly. I will also pull a carfax on it today to make sure the seller is on the up and up.

Any input would be greatly appreciated!