Appreciate all the opinions. I think I'm going to stick with 2yr/24k coolant flushes for now.
The point about gasket material from the OFHG is a good one. Fortunately mine was taken care of about 50k ago, and was done as soon as it was noticed.
Coincidentally, I need to replace the coolant line that runs in front of the block to the oil cooler. It's developed a scaly look in one area and the end that attaches to the oil cooler looks like it's cracking. Good excuse to do a coolant flush at the same time.
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