I used acidic test strips on the antifreeze a few years back and everything was good. I didn't expect Dex Cool to do any damage. I think it is just the head gaskets, and I know they are bad on many engines that are out running. I had perfect running CUCV's that I rebuilt and pulled the heads and changed the old head gaskets. When I pulled the heads, the head gaskets were going bad. Easter Find, and my M1009 Mule build both had bad head gaskets and Easter Find ran well. I just pulled the heads as a precaution. The freeze plugs are the only other thing that would put rust particulates in the coolant. I will be able to answer all these questions in a short time. Complete with pictures. Better to fix now then have a failure on the road and have it takeout the engine completely. It is 41 years old. It needs some attention. I just watched a video on 1978 Corvette pace car with 6 miles on it what it did when they started it and drove it. The seats basically cracked like clay and broke the leather into crumbs. I have a 6.0 engine here from a brand-new 2020 Chevy cutaway. That would be sweet. The roof was crushed in transit. 28 miles on it now. I won't do that. But I like the idea.
