How long has the engine been in? Was it built recently? The thread you linked to may be the problem. If the sealant isn't applied properly to the front cam cap it may be the issue.
But both sides? its not very likely
I would think that crankcase pressure building up would cause the rear main to leak too.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i