Date registered: Jul 2009
Vehicle: Current - 2007 S550, 2002 S430, 1997 E420; 1998 ML320. Deceased - 1974 240D, 1992 400E
Location: An island off the coast of Florida **Use startekinfo.com for official Mercedes technical guidance**
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You should do these preventive maintenance items to avoid costly repair maintenance. Strongly recommend using MB products for transmission fluid and engine coolant. AutohauzAZ.com is a great source for parts.
IMHO, you can do all of these yourself. In order of increasing difficulty for a DIY (and to gain self confidence), they would be:
engine coolant replaced - Its overdue. Use distilled water to dilute MB antifreeze
transmission fluid replaced - you will need to get a level dipstick
power steering fluid replaced - siphon with your wife's best turkey baster
belts replaced - there should only be one serpentine belt. Check for widthwise cracks in ribs
fuel filter replaced - no smoking!
brake fluid replaced - Motive pressure bleeder for $62 makes it easy
spark plugs replaced - Wait for 100k. Set aside an entire Saturday afternoon
The encyclopedia on this forum, and the stickies on the W210 forum are a great source of information for DIY like these.
Replacement of engine coolant, transmission fluid and power steering can be done in increments. Trying to empty these systems can be done, but it is more labor intensive and probably not as much benefit as you would think.
BTW - The W220 shares the same transmission with the W210 class. The sealed for life debate is over in that older chasis forum. I had to put down my 400E due to a transmission failure just shy of 180,00 miles. Had rolled 120k miles on that car, and failed to servcie the transmission during my time of ownership. Never again will I lose a MB to neglect like that.