sommmatt wrote:Your oil will completely drain out if you take the turbo feed and return lines off. Like, 100 percent.
Like, thats 100% wrong.
To OP. Draining the fluids before hand will save you some mess, although, the oil feed shouldnt leak all the oil from the block after removing the line from the block. It will seap some out, but not 100% or even close. After I swapped mine, I was about a 1/4 of a quart low, so...
When I swapped to my S/S lines and GT2871r, I didnt drain the fluids, although, after the turbo swap, I ended up changing the oil and coolant anyway, so, its up to you op.
Either drain the fluids during the removal, or before. If you are planning on all new oil and coolant, then drain prior to removal, just makes sense.