Thread cutting oil

You dont say what "alloy" but I assume its an aluminum alloy

Paraffin according to my "Intal" drills and taps information booklet

WD40 is said to be mostly white spirit plus a little thin oil so should be fine. Similarly I would think diesel oil

Dunno what your "Prolube" is. It appears to be a brand name encompassing a wide range of oils and greases
Agree with VicS, use paraffin when cutting aluminium.
 
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