OK! OK! Don't laugh me off the site! And I have the empirical proof! Unfortunately, I am not able to find the link any more, if I do I will post it. Basically, you make a condensation jar and put it inline of your PCV vacuum. For us dieselers this would be inline with our CDR. I have had one on my daughter's 92 Ford Ranger (my previous truck) for a few months. We have not seen ANY increase in mileage, and did not expect any even though they mentioned you would. And the first time I checked the jar there was about 1/4 cup of very dark oil/fuel. It did NOT smell at all of gas! So, I ignored it. The oil was changed and the other day I happened to check her oil. It was as clean as FRESH oil! And it had been about 1200 miles! Never, never seen that before on that vehicle! I am impressed and will continue to monitor it and report. At the same time, I had put one on my 2005 Dakota (yes, I am selling the Dakota for the Silverado! Anyone want an excellent Dakota!?) with 10K miles and was not impressed but, it is a new engine.

After seeing what it did for the Ranger and seeing how black and how quick my truck's oil goes black, today I put the sludge jar on the Silverado. Again not expecting much. Some black oilly stuff in the tube and hose connections. Started up and checked for vacuum leaks - none - of course, very low vaccum at idle. Now, I start up and drive to work. After 3 miles, the engine quiets down like I have never heard before - down the road and a idle! At idle the engine is quiet and smooth! It is scarry! Something BAD must be about to happen! When I got to work, about 12 miles, I left the engine idling and popped the hood to check for something leaking or broke but, everything was fine - just a smoother, quieter running engine! It will be interesting to see how the truck starts up and runs tonight after work. It has started well in the 6 weeks I have had the truck.

I will continue to monitor the engine operation and the sludge jar. It may be about 6 months before I will know much about the sludge jar since I changed oil about 600 miles ago so, about 2400 to go before a change. May be I will be able to tell if the oil gets any blacker/thicker than it is now. But I am VERY pleasantly surprised with the results so far - smoother/quieter!