CPU lifetimes/MTBF??

I recently attended a group meeting where the owner of a local "mom-and-pop" computer store spoke. Although not his main focus, at one point he pointedly said, "Do not buy an AMD CPU". The reason, he claimed, was because AMD chips go bad just beyond the warranty period. He said he has repeatedly observed this, so he prefers not to sell AMD systems anymore.

Does anyone know of more authoritative information on this topic? I realize that different people may have different experiences on a topic like this, so I'm hoping to find something along the lines of a website where some third party has done extensive testing or taken a broad-based survey to find the average lifetime, or inversely, the average Mean Time Between Failure (MTBF) of AMD and/or Intel CPUs.

I tried a couple general web search queries such as "+AMD +(MTBF | lifetime)", but I didn't find anything that addressed my question. Most of the pages I found dealt with overclocking or special cooling units, etc. I'm not interested in such "specialized" information but just on what an average user would encounter.