Not too familiar with the 3S but try giving it a good clean and watch it very closely, how much oil is it loosing (how often and how much do you need to top up oil?). Some one else would be able to give you a better idea of 'weak points' to look for.
EDIT: having a closer look, there doesnt look to be much from the oil feed itself (protrusion in block - the flat face that the oil feed screws into looks quite clean) and seems to be coming more from the gearbox? Rear engine seal?
Also, any reason why your manifold doesnt use the right most stud?
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