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FWIW, The shop that did our last service mentioned that original radiators can last in the 150-220K range with an average of ~180K. If there are no signs of leakage or other cooling system issues keep driving it. Ours didn't begin to show leakage till 205K. May as well take care of it if you are going to be in there for other service like ours was for the timing belt interval.
That is hard to say my Nissan lasted 17 years. The original was made in Japan. The replacement was $70 on amazon, no way is it the same quality. So imho why take a really good part, and replace it with a not so really good part?
This question is asked all the time of BMW indies when BMWs have electric water pumps--should I proactively replace my pump? I actually asked. Leave it to the indies to have integrity. The answer was why? I have seen them fail at 50k, at 175k, and everything in between. So why replace it proactively? Replace it when it fails. This is an indie that bucket washes cars....top notch! They usually don't behave as dealerships would.
Just had my 04 UL radiator replaced because of leak. 141,000 miles on original radiator. The last 12 years and 120,000 miles have been in the Phoenix area, meaning the radiator has been subjected to heavy work in this desert area. I'm happy with the life I got out of it.