After reading up about cryoseal. I might give it a try. It looks to be something that may just work, and one of the distributors specializes in mercedes benz and BMW parts and tools. so it may just be worth it to try it, unless price is ridiculous. If it does work as claimed, I would think the price would be somewhat expensive for a product, but if it saves several hundred $$ then itmight be worth it. Sounds like it will also stay int he system and seal other leaks as they appear.
But I am still weary of using any kind of sealant. My father once put bars stop leak in the radiator of my moms old rabbit, and on a trip to san fran, the raditor became completely clogged up and plugged.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.