Re: [MBZ] can some one help on coolant in 190E

[Peter Frederick]

The green stuff doesn't have sufficient anti-corrosive power to prevent 
corrosion of the head and radiator (and heater core, too).  Long term 
use will result in clogged or leaking radiators (or both at once) and 
severe enough corrosion of the head to blow the head gasket (happened 
on my sister's Volvo -- naturally, on the highway at speed, cost them a 
new rad and new head).

Even so, you must change it every two years for adequate protection.
Peter