Just made an appointment to get the coolant changed finally. After all the great advice form all of you I ended up buying the following:

Red Line Watter Watter $10.49 from Canadian Tire
Prestone Super Flush $3.99 from Canadian Tire instead of MB Citric Acid $24.00
Distilled Water $2.97 from Wal Mart


Mercedes Benz Thermostat $23.04


Mercedes Benz Antifreeze Yellow/Orange




I'll take a good look at the hoses when I'm there to see if I need to replace any them.

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz