One possibility putting 2 and 2 together is that it is just the intercooler o rings. Open the bonnet and see if you have an oily mess on the undertray in front of the battery and all around the intercooler pipe.
It happens when it rains and only when youve been out, so i think rain may blow through the front grills and simply be washing the oily deposits off which drip on to your puddle when you park up.
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