What he said. There is a ton of oil going through the turbo. If it can't drain out it will end up being burned. The turbo seals are not designed to hold pressure from the oil side out. On a gas engine this just makes it a mosquito fogger. On a Diesel it could cause a run-away. Back in the 70's I and a buddy decided to turbo an Austin Healey 3000. We used a 1/2" drain line. It burned about a quart every 5 miles. We upped the drain to 3/4" and all was good.
Bottom line, you don't want any pressure in the turbo center section.
The Constitution needs to be re-read, not re-written!
If you can't handle Dr. Seuss, how will you handle real life?
Current oil burners: MB GLK250 BlueTEC, John Deere X758
New ride: MB GLS450 - most stately
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510