So I am reviving a fairly old thread here because tonight I just had to top off my coolant. Three weekends ago I changed my IC pump with Johnson CM30. I thought I was good to go but my coolant light came on on Sunday and I noticed one of the hoses leading to the pump had a very slow leak causing me to lose coolant.

Order the Zerex G-05 coolant online (not the 50/50 blend but the full concentrate version) and, after tightening the hose to stop the leak. Added about 1 - 1.3 quarts of the G-05 coolant to bring the coolant level up to about an inch from full to top off the remaining OEM Mercedes blue fluid.

I didn't think to add distilled water to the mix until after. Am I going to damage my engine with the amount of un-distilled G-05 I put in with the Mercedes fluid (which is distilled)? Should I go ahead and add distilled water to top off the remaining 1 inch until full line?

Feeling pretty dumb right about now. Your input is appreciated.