No, I have a 50/50 mixture of coolant to water in the system now, but I want less coolant and more water. I want to do what JimF suggests, more water, less coolant. I put a bottle of watterwetter in a while back, and i took out about 3 cups of the mixture in the system, and added 3 cups of distilled water.
It didn't help much, I think I need to take more of the mixture out and put in some more water so that it will cool better when idling or stopped.
I guess I'll just use my distilled water, as I'm not sure if I have hard water or not.
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)