Hey all...
Just thought I'd post a quick update, my 05 E320CDI just cranked over 100,000 miles last week and it's still going strong. I did find out a few interesting things about the car which I'll detail here. My fuel economy dropped by about 2-3 MPG about 5,000 miles after I purchased the car. Finally, after much checking over of systems and what not I isolated it to the tire purchase I had recently made. Mercedes always uses the low rolling resistance tires on these cars. I went and put Goodyear Eagle RS-A tires on my car, I've got a law enforcement background and always liked having pursuit-rated tires at my command, especially here in Florida with some of the crazy drivers we see here - a few abrupt lane changes have happened without almost any warning to get out of the way of another driver operating with head up & locked (old airline term).
Also, something else to consider on these cars... if you go to change glow plugs on the US spec E320CDI, the only glow plug that will work correctly is the Beru, NOT the Bosch. I see anecdotally in some of the other forums that people complain about glow plug efficiency from time to time - many of them are using the Bosch plugs, those are Euro use only. Mercedes made a small change on the 05 & 06 cars for the US market. Many parts houses will spec the Bosch plugs but... they will apparently not work correctly due to the voltage difference, won't get the needed heat out of them. Just keep that one in mind.
Maintenance-wise, I've had to change the glow plug controller (yeah, I borrowed a friend's lift for that one!), motor and tranny mounts, had some problems with water leakage into the trunk (lot of W211's have issues with that) - water was coming in around the plastic rivets by the rear SAM and through the third brake light seal. All the electronics started going crazy in a heavy rain one day - time to find the water leak! I didn't have to but I swapped the steering wheel for the wood grain E350 wheel - looks a lot more classy, I changed out the climate control unit for the one out of the 07 E350 with the center display (it was strictly plug-n-play, no reprogramming required), and changed most front end components after my wife was minding her own business last year driving down US1 and this Ford Escape decided to make an illegal left turn in front of her and immolate itself on her front end. Luckily all the damage was bolt-on repairs, no frame damage - fixed with all Mercedes parts, no knock-off's. Grill, right xenon headlight assembly, hood, RF fender, bumper/bumper cover, the right side bumper support/crash isolator. The crash didn't blow the interior bags, could have been a lot worse. Roughly $8,500 worth of damage to our car though. Oh, and the sunroof had to be changed out twice before the rain leak was stopped. Mercedes sunroof seal problems, bleh. I did brakes (pads and rotors) at 44,000, with 100K miles on it now they're still stopping strong. Reset the SBC counter at about 95K miles, so it should be good to go for a while yet before I have any SBC issues.
Next time I do tires I'll put low rolling resistance ones back on to regain the last few MPG now that I know what I did wrong. The values on these cars are still up, and this one's a keeper. Only mod I might make down the road is to swap in E55 buckets instead of the MB-Tex leatherette seats, this way I keep my dynamic seating intact. The E55 buckets are essentially the same as what I've got in my '08 E63, nice supportive seats. DEF for me stands for "Don't Ever Fill"
Thanks
Eric