I was unaware of this, but I just read that one (or more) of the exhaust studs go into an oil passage in the head.

Can anyone confirm/deny if this is the same passage that feeds the turbo with oil?

Thanks!

EDIT-did some research and read that it's the lower 2 outer (bigger) studs that hit the oil drainback holes in the head..?

 

Some go into the oil drain passages but do no protrude from them. None interfere with any pressurized oil passages.