Do a Google, there are sites out there where you can find TSB’s and recalls for just about any vehicle. Here are three links I have saved where you can find TSB’s and recalls. The TSB below on the SLK 320 3.2L engine can be found on the Edmunds site.

Also, it has been my experience that dealers will not volunteer TSB information with the public. They are mainly for the use by their service people. The customer is generally left holding a bag of nothing and has to research things on their own.

http://www-odi.nhtsa.dot.gov/cars/problems/tsb/

http://www.ownersite.com/TSBMain.cfm?action=year

http://www.edmunds.com/maintenance/MaintenanceServlet

Component Description:
9. ENGINE AND ENGINE COOLING:ENGINE
Bulletin Number: 070021A
Bulletin Date: OCT 2002

Vehicle: 2003 Mercedes-Benz SLK-Class
Summary:
SOME MODEL 211 VEHICLES EQUIPPED WITH ENGINE 113.967 MAY EXHIBIT ENGINE TICKING (PISTON SLAP LIKE SOUND) NOISE WHEN ACCELERATING BETWEEN 1200 AND 3000 RPM. *TT