Yes, and I think these models have a 10 or 12 year coolant change interval. I'm not sure how the bag of gel works, other than they replenish corrosion inhibitors that get consumed over time. I've not been able to get much information on how modern OAT and HOAT coolants protect against corrosion. Corrosion is a very complex subject. A lot of corrosion mechanisms are not well understood, and there aren't too many "corrosion control engineers" out there.

Some modern corrosion inhibitor formulations are patented, so a search of the patent documents could yield some answers on how they work.

Duke