At the dealership on a CD.
Look up in your manual or let your mechanic do the work.
Gustav Franklgurt
your questoin is not specific, there are many pulley's
Take it to a garage!
Here is a link to a online manual. http://www.manualowl.com/a/Mercedes/2003-SL-Class/Manual/3807
110 ft. pounds, or 135 nm.
The 2003 Mercedes-Benz SLK-Class has a 6-speed manual.
The 2003 Mercedes-Benz C-Class has a 6-speed manual.
Haynes workshop manual at any Halfords
2003 230K has no dipstick.Oil level is checked via dash readouts.
Mobil 1 that is your OE Oil
find it at mercedesmanuals.com