I always feel sheepish when I mention that my 61K mile 2001 VX uses ZERO oil between 5K (synthetic) oil changes - kinda makes me feel "guilty" that I'm not having this problem!

Big Swede, I hope you don't mind me quoting your post from another oil consumption-related thread:

"Sometime in 2000 IIRC Isuzu changed the piston oil ring design to include additional drain holes. This was the primary culprit, although clogged EGRs seem to be a contributing problem too, near as I can determine.

The updated design can be identified by a screw-in PCV valve, as opposed to a push-in design earlier..."

This got me curious, so I went out and checked mine. Unless it was changed, mine is (still) a push-in PCV valve (it's an Isuzu P/N/# too), for the record...