Based on the positive reviews here - or rather lack of evidence of adverse effects - I've just tested. In the cooling circuit of the warm engine filled, the engine still running something and the next day the spot was much smaller, on the next morning there was nothing to see.
After half a year everything is okay, we have spared us a probably expensive repair. And even if it does not work in any case - with a stake of 5 Euros you can give it a try. I Wish You Success!
