Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1068 Post(s)
You have Flexible Service System that determinate oil change. The system changed over the years, so check with the manual, but most common to access service meter is pushing the reset button twice. Cars with wheel buttons have it more complicated.
You might go to the section dedicated for your model for more precise answers.
Welcome to the forum.