I'm sorry to hear about your radiator. I'm just now getting serious about what appears to be a leak in my heater core (see the thread on the Diesel list).
I was curious about your use of Gunk stop leak. Was this helpful in any way? Is it worth a try in my 300TD? I eyed the product at the parts store last week, but was nervous about adding something other than MB coolant and water to my system.
'87 300TD 304kmi (RIP)
'95 Toyota Camry Wagon 125kmi