I've been told in the past that mixing water and ELC is a very bad thing, and can lead to sludge in the system. However, I just read this file from Caterpillar and they're saying now that deionized water (or even conventional coolant) is acceptable to add in an emergency. I distinctly remember them saying that mixing water or conventional coolant was a very bad thing to do, so I think they changed their stance on it in recent years.So a read on another thread that residule water in the system when used with ELC will cause sludge?? If i mix the system 4 gallons CAT ELC concintrate with 4 gallons distilled will i have a problem??