As many will know I have been fighting wicked oil usage on my 945t (91, b230ft 145k, 5 spd) for a couple of years now...with little success... for those NOT in the know...

1. no external leaks (i mean NONE)
2. new turbo - no evidence of extesive oil from it
3. no oil in the intercooler
4. PCV system cleaner than a really clean thing
5. One way valve installed in the PCV system to the manafold
6. Compression tests just fine
7. Tried just about every oil going (dyno/synth whatever) makes no difference to the usage
8. Tried auto-rx, comming tothe end of the rinse cycle, engines quieter, but no difference to the oil usage (well maybe down a tad...could be my imagination)
9. car pulls like a train...
10. oil usgae is 1ltr /350 miles if my wife driving it (shopping trolly on wheels, little sustained boost, low revs round town) 1 liter /200 miles if I drive it (boost, higher revs, longer runs)
11. NO smoke at idle (for 20 mins...) Smoke under SUSTAINED full boost and (im told by following driver) down hills (high vacume) smoke under boost seems to trail off, like it gets a dose of oil...then not a lot more...

at this point my thinking is...

Inlet valve seals, high revs put more oil in the head..so more burnt. High boost AFTER vacume pushes the oil in the manofold thru the engine, perhaps work guides/seals also allow some boost into the cam area leading to added blow by into the cylinders... High vacume sucks oil past the seals...

Now the question is:-

1. Do the seals with the head in place.
2. Have the head pulled and rebuilt
3. Get a second hand head and rebuild.
4. Fit new engine
5. Sell car and buy something else (960...850 t5 etc)

basically i have my own veiws about the pro's and con's of this wouldbe interested in others views and vieews on my diagnosis.