If you wantto do a fuel injection cleaning, I have heard that this product is supposed to be top notch:

http://www.autobahnpower.com/products.asp?recnumber=92


Here it is from their homepage:
http://www.bgprod.com/bgprofessional/bgproducts/autofuel.html

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz