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I just asked this question on miataturbo.net
if your serious about turboing and have little experience (like me). Join there

http://miataturbo.net/forums/showthread.php?t=4242

 

[Sid]

did you look at miataturbo post? the answers were there...

 

[Sid]

In the rear of the engine block, there's two bolts blocking off oil and coolant. If you're turbo'd or turbo'ing then you know which one is the oil, the other is coolant.

I thought they were BOTH oil. do you have this on your car?