Guy,
There is no simple answer to your question. However, with a little more information, we can narrow down the possibilities, especially since it looks like you are showing a picture of the crankcase breather hose where you apparently think the source is. First, have you calibrated your crankcase dipstick, or are just filling the engine oil according to the factory marks on your dipstick? Next, have you checked and/or cleaned the crankcase breather system and/or screen? Next, what RPMs are you running at when this happens? Last, like David said, what are the engine and transmission temperatures when this happens?
Gerald