Join Date: Jun 2009
Location: Ocean Isle Beach, NC
Vehicle: 2003 SLK320 31,000 miles
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Lots of different questions/issues here, so here is my take.
The cooling system on your car I believe is on a 3 year service interval. Starting with my 2003, they went to a 15 year/150,000 mile interval. The proper coolant is important and Zerex GO5 or the Mercedes branded coolant are about your only two options. The Zerex comes in two flavors, one is a 50-50 mix and the other is full strength where you have to add distilled water to it to get to your desired mixture. Mercedes also has their own recommended products for cleaning your system. I personally would not ever use a McParts store cooling system flush. A home remedy is to deoil first with something like liquid Tide or dish washing soap and then descale with citric acid. However, if your system has been serviced regularly and the coolant comes out looking nice and clean, then it's unlikely you will need to do any type of serious flushing. Most oil change shops will take your old coolant. Some jurisdictions allow you to dump it down the drain and let the city sewer treatment system take care of it. Your cooling system should be self bleeding, but it probably wouldn't hurt to raise your front end and let the car run with the cap off for awhile.
2003 SLK320 36,000 miles
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