Originally Posted by Michael Kerley

For 1998 the 500 came standard with the rear hydraulic suspension. Our wagon has it. It's a brilliant system and well worth the extra upkeep. My theory is, over the long haul, it actually saves money on suspension upkeep. It also gives far superior ride and handling under all conditions.

1997 is the last year for the M104. If you wrench it yourself, you'd greatly appreciate the relatively open engine bay and lighter weight over the front end (and it's long term impact on the suspension). Compared to the 500, significantly fewer 320's were brought to the U.S., though.

The Xenon headlight system was optional those years. I think they perform and look better (especially since they don't have those ridiculous wipers attached to them).

The panorama roof was optional those years. It seriously enhances the car's aesthetic stance.

Also, if the SL is your daily driver in real world conditions, could I suggest that the sport suspension package is a bad idea. The standard suspension comes with sixteen inch, relatively narrow wheels connected to 225 rubber all around. Any narrower aspect, and the already tight set up gets harsh quickly.