Originally Posted by compress ignite

Chas, Pardon my stepping on your advice....But,Simple Green does Ugly things
to Aluminum.

Dawn dish detergent ,in solution with water [or "Shout"] (may require Multiple applications)
will De-Oil the cooling system... Then Flush,Flush,Flush.

(Same procedure for De-Oiling as CAF ,Warm to Operating Temps @ Idle and run
for 5 minutes @ IDLE...with heater on Full Hot.)

I do concur about the correct Temp thermostat application (ONLY)for your Chassis/Engine...
Re-engineering the Mercedes cooling system with a positive outcome just ain't gonna happen.
[USE a "MERCEDES" Thermostat ONLY.This is one application where saving $20.00 is foolish]
AND test the Thermostat,in a slowly increasing temperature, pot of water.
[Do Not get Caught by the Empress of Cuisine,using one of her Cookware(s)]

Unfortunately,Horror Stories Abound of Owners driving for extended periods
using CAF as a Substitute for Coolant Mixture..."I'll Clean it out,Really Good".
The system (especially the WATER PUMP seals and Bearings) HATES exposure
to ACID LEVELS ...AND will notify you by decomposing as you drive.