Both my mate & I found the diff to evaporate the oil, although Bent said this is impossible with silicone oils. We found the oil would turn black and the viscosity would turn to a paste. We have used all the manufactures oils and all have found all to be the same. I've put it down to the small tight and twisty tracks here in the UK which is over heating the oil. After 4-5 runs we could tell when the oil was getting low as the would start to over rotate in the corners and become very unpredictable. Both my mate and I now run the ball diff which is far superior and manageable, just don't let it slip and ensure you don't over tighten.
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