When I got MitsFix to do the 380 conversion last year, I had them fit a new genuine radiator as part of the job.
New top & bottom hoses were also fitted.
I was not experiencing any cooling problems at all at 190,000km, but I thought it was sensible to replace it then rather than experience problems later.
My estimate was that about 250,000km was the outer limit for radiators based on what I was seeing here @AMC.
I probably could have waited a while longer, but as I was spending significant money to have a low km 380 engine fitted, I thought it was wise to take some "insurance" to protect the investment.
When I purchased my TL AWD almost 5 years ago, the temperature needle was, once warmed up, always sitting on one needle width below half way under any and all conditions.
I hope it stays that way for a long time to come.
P.S. I had the steering rack and alternator, both without any problems, replaced at the same time with brand new genuine items.



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