I'm kinda getting in on this late, and only read the thread hoping to get an answer to the original PCV question but...
It sure looks like the basis of olds' argument is the idea that 'combustion temps' and 'exhaust temps' are different and completely independent of the other. Is that what you are saying olds? I absolutely disagree with that claim.
gregweld has provided documentation that combustion temps are lowered through the introduction of recirculated exhaust gasses, via the EGR valve.
A lean mixture=high combustion temps= high exhaust temps. The opposite is certainly true. The recirculated exhaust has the effect of fattening the mixture without introducing more fuel. Rich mix= cooler combustion temps= cooler exhaust gas. I'm just wondering where that's losing anyone.
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