Just an update to this situation. My engine now has 7500 miles on it, it runs so well and has noticeably loosened up in the last 2-3k miles. Just to test recently, it has been about 0 degrees celcius, I gave the car 2-3 seconds on glow plugs and it fired first rev and no missing, timing is set to 0.87mm. To me this says compression is awesome, but I am still going through approx 1 litre every 1000 miles. Apart from a brief period on 10w40 I ran the engine with 15w40 mineral up to 5000 miles and it is now on 10w40 again. No change to consumption between the two oils.This is exactly the same amount the car was using before engine and turbo rebuild.Is this issue indicative of a broken oil control ring?
...BTW your Bieber avatar is awesome.-Malone