Listen to ME. I just had my engine decarbonized at my local MB indy shop. He was changing my fuel injectors, as well. I had brought it in because I thought I needed new valve seals --- it was using 1 qt per 600 miles. He said, no, I needed a full valve job -- well, I vetoed that.
He called while doing the injectors and recommended the decarbonization. Well, I didn't even know what it was -- but he explained it (not the water, but another solution) and I okayed it.
Well, the car runs like a dream now AND I DON'T USE ANY OIL AT ALL!!!! Evidently, it wasn't the seals. But maybe a oil ring, etc., that was blocked or didn't fully engage because of carbon buildup. Anyway, I am sold on this.
1994 C280, dark green metallic
1991 190E 2.6, Black
(sold to another forum member)
2003 Chevy Tahoe LT, Redfire Metallic
1989 Mustang GT Cobra Convertible