[JFP in PA]

I have never seen an OEM pump with a metal impeller, and I've seen quite a few pumps over the years. The life of the pump is always a question; some seem to go on forever, others break up after only a couple of years. Because the failure of the impeller can result in little bits blocking vital coolant passages, preemptive changes have become more common in recent years, usually in the 3-4 year range, or when the cooling system needs to be opened up.