What would it happen if the turbo oil drain was bellow oil level in the sump?

The thing is there´s no point in the oil sump were to put the oil drain above oil level...

 

I believe some people have put the drain in the oil level as long as the turbo/drain line connection is above the oil level point. I can't say for sure because it's one of those techy science involved deals, but I believe some have had success doing it this way.

 

I've seen low mounted oil drains that worked out okay, but you have to make sure to use big diameter drain line.

You could also punch a drain hold through the skirt in your block, right above the oil pan. Some of the Miata turbo kits use the dipstick as a drain... heh.

 

 

you can use less oil in your engine too-- like go just a little over the lower line on the dipstick instead of all the way up to the second line. That and remember the oil level when running is different than when off because of all the oil running through the engine, so it might not be below level anyway when the engine is running