Buy the reamer.

You will surely extract a lot of crud from the chamber with this tool.
Rent it if you want or just eat the $60 and buy it. If you own your benz for a while, you will probably end up doing the GP more than 1-2x.

PMU

__________________
Phil
Previously loved
variety, but I miss the 99 F350 PSD- 37k, traded, damn

Current stable
98 E-300 TurboDiesel, 253k
http://www.facebook.com/people/Philip-Underwood/762882374