I'm going to flush my system with the prestone stuff and then change it out several times after that on short intervals.
There is some orange film left from dexcool a long time ago but I changed to G05. The engine cools well so I don't want to do a CitricAcid flush.

At 2 bucks a gallon.... better than just water, but not a permanent thing. I normally run the zerex and distilled.

I do have another problem. Slow coolant loss. Haven't been able to figure it out. I just add a little water every few weeks to top off the reservoir. Not much, but I eventually dillute my antifreeze with more distilled water than it should be. Is the block drain bolt ever the culprit of a slow leak?

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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI