There are 2 drain cocks in the block - front bank and rear bank.
The following image is from section 14/Magna Engine Cooling of the workshop manual:
click on the image to enlarge.
I am sorry for the poor drawing, but it is the fault of the workshop manual - not me.
I have not tried to reach these on my car, but I believe that they are somewhat difficult to reach.
On a 380, I believe that there are also the "cats" in the way, which may make things more difficult.
The threads need coating with sealant when reinstalling.




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