Hello Everyone
Note:
I am not attacking anyone.
The sad fact is that I am stating real world design engineering fact.


Hello BoostnBenz
My overall statement was directed at all current 2004 production off the line, the only exceptions where noted.

As to your current radiator, at 189k miles on the original radiator.
The service life is 100K or ten years.
Yes, the actual materials loose heat exchange capacity over time, it may look perfect, but I can put it in an Automotive Radiator Calorimeter and prove the massive cooling capacity loss.
An average of 20 - 40 percent by your description.
I am NOT saying that your radiator is bad in the generally accepted ways, reduced capacity is not as blatantly critical as a massive leak.
However it can cause the engine to run just a little hotter over a longer time, which soon leaves you no margin for error.
I know that a couple of degrees does not mean much under average conditions, but how long does it take to overheat enough to warp the head, is the cost of a new radiator worth the risk.
My rule of thumb applies to all 2004 current production vehicles.

Hello Rick Miley
I am not sure how you derived this question.
What I am saying:
All Current production vehicles coming off the line have Planned obsolescence engineered into every wire, module, and scrap of metal or piece of plastic.
At or around 100K they are designed to fail.
You can throw money down a hole trying to keep it running for a while longer; but it is a loosing game plan.
The other statement was
Why waste time repairing a used-up (junk) radiator?
When a new radiator is $200.00 or less.
If you repair it and it has a catastrophic failure at the wrong moment; you loose your engine.
If you patch it and patch it, etc, etc, it is not cost effective (in terms of your time).