Wow...In 90 seconds Loubapache replied, and two others hit my question...
I amazed. Thanx, Loubapache. I have found a Sun Motorvac not far from my place, at a shop that specializes in big highway tractors; ergo, my concern that this device may produce too much pressure in my little Mercedes, and blow some gaskets or worse.
I'll make the apointment, get my engine cleaned, and report back.
Again,Thanks.