I used the Bar's stop leak before without incident and I like to keep it circulating in my system to keep everything lubed. Yes, it stays in the system forever and I had to flush my engine like 3 times to get it all out. Anyways, I was able to identify the leak. It was the bypass hose going from the water pump to the cylinder block! @#$*ing Mercedes! That hose is maybe 2-3 inches long and the gap between the clynder block and water pump is maybe is thick as 2 nickels! The entire water pump, sterrping pump, belt, and maybe belt tensioner must be removed to get to it. I bought a grinder the other day because I planned on grinding down a little bit of the cylinder block side, but the grinder would not fit. I then started sawing at it with a small hacksaw, but I was not able to make much progress. After analyzing the situation a bit more because I refuse to take everything apart to replace a small hose, especially since that may cause me to open up a can of worms in regards to my belt tensioner and water pump, I decided to cut 1/4 inch of the rubber hose I had then I lightly greased the edges of bothe sides. I was able to put it in between the small opening at a 90* angle and slowly work it around the cylinder block side. Then I slid it back as far as it would go towards the cylinder block and I pushed the remaining part down and then pulled it forward to cover the water pump side. Hose replaced. Take that, MB engineers! Problem has been solved.

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1990 190E 3.0L