I cannot believe this stuff worked so well...Diesel Purge then Diesel Kleen on Mercedes OM606.

I show step by step and what hoses to connect to and what parts and tools I use. I ran 2 cans of Diesel Purge from LiquiMoly through it, then added 32 oz of some Diesel Kleen from Power Service on top of that at the end. It changed the color of what was coming out of the discharge line, I think it was a great combination and about 25 bucks in all. I have driven about 400 miles and it is running fantastic and much better mileage to boot. no smoke any longer and runs great. will be changing the fuel filter shortly.