Bob,

Noted on the possible O2 and cat damage. In your opinion/experience, is this in extreme cases only, or is the risk high even with light carbon burn off?

Billy,

I had to laugh when you mentioned people buying things long before they need to. Stick around these forums a couple months, you'll see that's pretty much par for EVERYTHING replaceable, from oil (3k is still the standard for many, not me) to filters to spark plugs. The reason is often "cheap insurance", but cheap is a relative term and parts prices are FAR from cheap these days. Oh, well -- it DOES help the economy!