/6 Cooling System: Multiple Cleanings

Yes, G05 has plenty of inhibitors. It is the coolant used in a lot of modern Mopar stuff. Look up HOAT coolants.

The heater core and rad were well cleaned and flushed multiple times by me before this. Rad was not rodded, but was removed and backflushed 3 times. There was indeed still rust/crud left in the block and head even after the acid tanking.

That is it point here: that all was a very thorough cleaning, much more than any good driveway flush job. So for those cleaning out an older engine, a good flush is likely not going to complete the job in one pass. It will take several flushes and cleanings, with some running in between, to make up for decades of neglect.