I have a low millage (60,000) 2010 Nissan Xterra that currently is in near new condition with respect to appearance and mechanical condition. When having my car inspected recently at a local garage I mentioned to the owner/mechanic that at 62,000 miles the transmission on my Ford Ranger truck had fried due to a cooling line failure (ironically in front of the Ford dealer where I bought my truck). He informed me that I should be aware that there was a major problem with the Nissan Xterra and Frontier truck whereby radiator coolant would leak into the automatic transmission causing total failure. I have looked this issue up and it is extremely common and expensive with a new transmission costing about $6000. I can preclude the problem by having a redesigned radiator installed which I am thinking would probably cost at least $250 for the radiator plus 3 hours of labor. My question is this. Should I spend $550 or so for a new radiator when my car is currently working fine?