Thanks Warren. You have a nice write-up.
Here's a bit of a quick and dirty:
The MY'00 - '02 W220 had more maintenance problems than one would expect from the Mercedes brand. The U.S. magazine Consumer Reports rated them quite low - but more recently has brought the rating for those model years up to "average." The '03 and later were more reliable. The '05 and '06 (which are identical cars - when MB didn't produce enough W221s for global introduction as an '06 model, it simply continued production of the '05 for another year, as the '06) were on an upward trend in reliability that continued into the '07 W221, which J.D. Powers found to be the highest rated (best) luxury car on the market for initial quality.
The earlier S600 tended to have engine problems; later ones had fewer. However, V12 maintenance is expensive, and relatively few techs can really work on them successfully. The W220 S-Class Encyclopedia sticky at
http://www.benzworld.org/forums/w220...tart-here.html has links to the some excellent writeups of the experience of an S600 owner.
Between the S500 and the S430, both have great engines. The earlier S430s were not available with all of the features and options on the S500, but in later years (I think in '03, but I know by '04) all of the options available on the S500 became available on the S430; it would depend on how the car was equipped when ordered.
The electronics busses changed in '04, going from a Mercedes proprietary bus to an industry standard bus. This means that if you wished to do 3rd party retrofits to the audio system, for example, or add a cell phone if the car lacked one, more options are available from '04 on. I would recommend buying an '04 or later model for that reason. There is more detail in the Buying Advice portion of the Encyclopedia sticky. If the car you are interested in does not have a cell phone, you might be interested in reading the first seven posts in the thread at
http://www.benzworld.org/forums/audi...ades-plug.html
There are two suspension types. Automatic Body Control (ABC) is an hydraulic, computer-controlled system that provides wonderful ride and handling. When it breaks, it is more expensive to repair than the other system, a pneumatic system called Airmatic. The Airmatic system (which also provides superior ride and handling) probably results in more problems than any other in the car, and used to be extremely expensive to repair. However, MB has improved the design of its seals in later years, so they are a bit less likely to fail (I have never had to replace struts or the pump on my '05). If a prior owner replaced his struts, they may be the better OE, or they could be an excellent strut from Arnott industries, built with the better seals and having an internal air bag with thicker walls than OE - and the sell from 1/2 the price of OE (if new) and ÂĽ the price (for remanufactured). Both Arnott types have lifetime warranties.
The S600 and S55 both have ABC suspensions, standard. The S500 and S430 had it as an option in most (but not all) model years.
Since you live in snow country, you might want to consider the 4Matic (full-time all wheel drive) drive train. It is marvelous. I have it on my car, and it is even helpful during our tropical downpours. It was great in Maryland's snowstorms as well. It is available on both the S500 and the S430.
Those are the basics; there is more on the comparisons between models and model years in the W220 S-Class Encyclopedia sticky, in the very last section. You might want to take a look at it for more detail.
As far as the W220/W221 comparison: An '05 or '06 W220 will be of the same build quality as the W221. It will be lower priced. Beyond that it is a matter of preference. The S550, as one member has pointed out, has more power than either the S500 or the S430. But I have not found additional power always to be a bonus in snow country; it is often a liability. No one would describe wither W220 as underpowered. The rest is personal preference - I like the exterior styling of the W220 much more than the W221 (in fact, I dislike the exterior styling of the W221); I like the interior of the W221 just a bit better than the W220, but not so much I'd trade.
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__________________
Warren
2005 S500 4-Matic
with Gateway 500 iPod integration
1978 450SL restoration project
Formerly: 2000 S500
with Ice>Link iPod integration
Moto V710 phone with MikBox
Upgraded Voice Control