First one is a Northstar engine. Shockingly high percentage of head gasket failures. Just a vice of that engine.
Second is a S10 pickup. He doesn't mention what engine, but judging by the price paid it's most likely the 4.3L Vortec, which I had a head gasket fail on my 1994 4.3L which was green stuff.
Then, 3800/60*, followed by a 3800, followed by a 3800, followed by a 3800/3400, followed by a 3800/60*, and the list goes on. Hmmm... noticing a trend?
Again, show me the engines not known for gasket issues. If it was Dexcool, they'd all have gasket issues. Yes, Dexcool can react badly to contaminants in the system, but it's still a superior coolant. Lasts longer in a maintained system with less degradation and no danger to aluminum parts.
People try to give it such a bad rap it's ridiculous. An old exercise in logic that pertains to this situation comes in mind. Someone completely new to this planet shows up and starts walking around. There's a fire somewhere. They hear all the sirens and run to see what is wrong. They see the fire dept there. Same thing happens the next day, and the next. Without knowing much about our world and our society, they logically conclude that since they see the fire dept there every time the fire dept is starting fires.
People blame Dex because it can fall victim to other problems elsewhere, but it isn't the original cause. Like I said, I put the yellow stuff back in. But when people start accusing Dexcool as being the root of their problems, I have to say something. Those people just don't understand what really happened. Since it is possibly such a problem, I'm going to start driving around on wooden wagon wheels again because something sharp on the road might give me a blow out. If I did have a blowout due to a piece of wood covered in nails and ****, I could blame my car running of the road on my tires because they have the potential of being punctured.
I'm done. I've seen this case fought out several times. Fought it enough myself. If you want to believe Dexcool is some evil creation, go right ahead. The people who designed it are smarter than both of us, so it's all moot anyway.