I like to see some oil useage as it shows the bores are being well lubed.
Going off topic abit......but i usually do
I accept your experience Mark.....and if you say its a good thing, then fair enuf 
What i have noticed over the last few years of buying second hand vx's to use as taxi's.....and will make a point/conclusion at the end.....
2001 VeccyB bought 2 years ago with just over 110k on it.......serviced as per vx schedule before i bought it.....every 20k miles into the vx dealer (lease car) ......from day 1 this motor used 1ltr of oil every 2k miles .....now with over 210k miles on it.....oil/filter changes every 10k since ive had it....its still using 1ltr/2k miles
2003 Omega.....using oil as above post
2003 VeccyC.....uses some oil....bout the same as Omega...but tho it was a lease car too.....according to service records used to see the vx dealer more frequently than 20k.
So....onto my point.....or conclusion.....
Vx say 20k for service schedule......i think this is just to satisfy the fleet market.....vx know that engine damage will happen doing oil/filter changes only every 20k...but have worked out....that the fleet market are happy with 20k changes....and after 3 years the car goes back....so dont care what state the engine is in.....its lasted that long.....what happens to it after that doesnt matter.
IMO The engines carnt go 20k miles inbetween oil/filter changes definately.....10k they seem too....tho you or others might disagree and need sooner changes....but i have changing oil/filter every 10k on all my vx's.....this appears to have stopped any more engine wear.
Thats my obversation on vx engines......your comments welcomed 
Some observations of my own, though no firm conclusions...:
First Omega was ex-lease R-Reg 2.5, bought at 10 months old with 20k on the clock and no service history. The 20k with no service was out of spec even according to Vx because at the time the service interval was 10k/1y. I picked this one from several other on offer at the time because the front discs were practically new – no grooves or lip – so the 20k in 10 months must have been done on motorways…
I Had it services by Vx on the day it was bought, and annually/9k afterwards. Ran the car for three years and sold it with 60k on the clock. Oil consumption was nil, apart from one single occasion during a long motorway run the ‘oil low’ message came up on the MID, I pulled over at the services and had to add 1/2L – never happened again so still a mystery.
Incidentally, this was the sweetest reving and most refined Omega V6 I’ve ever seen, I test drove a few others and none was as good, including my current Y-Reg V6 2.6. I put it done to the fact that it did it’s 20k on motorways and had no oil change – sounds odd, but some say that to frequent oil changes on new engine prevents it from bedding-in properly. If this is true then it t definitely made a difference on this car…
My current Omega was bought at 4 months old with just 6k on the clock, I had it serviced annually/9k by Vx since though I supplement it with 4.5k oil changes I do myself.
The engine did not consume any oil up to last year, and now at 6y/50k I loose 1L per 2k miles, some of it was due to camcovers which have now been sorted, but the jury is still out on whether the car has further leaks (most likely…) or just started to consume oil very suddenly - I did not have time to investigate yet, but will look into the oil lose issue soon and will report back…