The W210 E Class was introduced in 1995. Development started in 1988. Like the W124 it replaced in MB's lineup, it was designed to last a long time. But, like the W124, if not properly maintained, it can become a very expensive car to own.
The most common problems with these cars are sensors, electrical gremlins and other minor annoyances. The rear suspension is hydraulic and parts can (will) fail over time. The automatic transmission - like many from back in the late 1990s / 2000s - is a "sealed for life" unit. Forget that. If it hasn't been done already. "unseal" the transmission and change the fluid. The life of your transmission will likely then last the life of the car.
By the time this car was built, MB had worked out most of the issues earlier 4-Matic cars had. Like the rest of the car, if properly maintained, the 4-Matic system is an effective, reliable AWD system.
The rest of the car is pure Mercedes Benz. Luxurious without being stuffy. Solidly built. Well laid out. Secure feeling. Basically, everything you would want in a winter car.click here to see the Craigslist ad.
Maybe because of, or possibly in spite of, the Ford content, the X-Type, especially 2005 - 2009 models, seem to be fairly reliable cars. Like any car coming from a European luxury manufacturer, maintenance is a must.
Like the Mercedes above, the Jaguar automatic transmission is a sealed for life unit. Again, forget all the "sealed for life" stuff. Changing the fluid will keep your transmission healthy and happy. Also, there have been problems (mostly moisture related) with the X-Type's Transmission Control Modules. Often it is mistaken for a bad transmission. While a TCM isn't cheap, it's a whole lot cheaper than a transmission. (Which is not to say that all transmission related problems are the TCM. It really could be the transmission.)
The V6 is a Ford Duratec based motor, to which Jaguar added their own touches (most notably the intake system). They seem to be strong engines with no serious weak points.
In my opinion, had Ford decided to make this look more like a Jaguar and not a Mondeo / Contour in a Jaguar costume, it might have been a very successful car. But, many years later that works in our favor. Used X-Types sell for very little. It's a very good car that you wouldn't mind driving all year round.Click here to see the eBay listing.