I purchased a radiator with a "lifetime" warranty from radiators.com. If you read the small print on the warranty they require that you replace the coolant annually. If you are using the Toyota stuff, at $19+/gal it wouldn't take long to pay for another "lifetime" radiator. They also require you to send the radiator back to them for "evaluation" at your cost. See if you can get the warranty requirements before you pay the extra for it.

1997 T-100 4X4 Xcab,Warn Hubs
02 Camry LE
2008 Yaris