my valve cover leaks too, and i dont know what it is. ive replaced the actual cover and gasket, and ive replaced the gasket on another occasion. now, after maybe 2-2 1/2 months of "heavy driving", there will be a little bit of oil in there, so its not so bad. it just seems to be a problem with dsms. like crankwalk.

as far as the oil return line goes, there is a lot of stress on that line. It goes from the turbo to the oil pan, and gets a lot of movement from the exhaust and turbo. mine leaks too, only very slightly. well, it used to be slightly. ive kinked it recently trying to put a new manifold on and now it gushes out oil. i just ordered another one from mitsu. $11.89. 2 gaskets for it, $2.00. not too bad.

run 93 or the highest pump gas you can find. in michigan we had 94
but i can only find 93 down here, before i get into jet fuel and such.

your clutch is either about to shit a brick or its not adjusted correctly. have you ever really got on the gas and the trans slipped?