2016 GTI - I found research showing that a particular coolant additive will lower temps around 8F so I bought it. I don't have a radiator cap to open and pour it into, just an overflow tank. Does coolant really cycle in and out of that thing? If I don't go over the max line, do I pour it in there?
Not a large difference, but not nothing: http://www.superstreetonline.com/how-to/engine/0703-turp-cooling-system-additives/
I got the HY-PER LUBE.
Posted Jul 16, 2017, 9:33 PM UTC · edited
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