190E double gasket?

[ssanmor]

Hello all.
After a major mixing of engine oil in my coolant, and a throughful examination of the head, my mechanic has discarded that is is cracked. He has supposedly been told by a Mercedes dealer that my car (190E 2.3 8v, 1992) has a kind of "double" head gasket, and one of the gaskets tends to deteriorate with time, and he has checked that it was effectively in very bad conditions. So they only have to change it and clean all the cooling system, that is contaminated with a lot of engine oil.

Do you know something about this or is it a fairy tale?

Thanks!