As with many problems, the key to the solution is in clearly defining the problem. This has gone from how to reset FSS, to does it have FSS, to the little wrench displayed on the instrument panel. Seems like I remember reading that all FSS cars require the fleece oil filter. '97 M104 engine does not use the fleece filter.

So, specifically, which light is this? For my '97 S320 there are 6 to the left of center and 8 to the right of center. The Check Engine light is the rightmost light on the panel. According to my owner's manual the Check Engine light displays the words, Check Engine. Mine has never lit, so I don't know what it actually would display.

Steve