Hi Bill.
I saw this as well prior to them noting K-Seal in the cooling system and at £1999.
I bought my Firefrost ZT-T 190 which had K-Seal added. It's dreadful stuff. Looked like someone had poured seawater, sand and all in.
It's a nightmare to flush out, and even then it may well have clogged the water ways in the block and the heater matrix.
The reason it had been added to mine is a faulty oil cooler. Unfortunately the temperature is still not behaving as it should.