hi had this problem so booked in for cambelt service new clutch, with new oil seals both ends of crank, garage found slight oil leak from turbo, so that was done allso, the turbo supply company said they have been selling quit a few of these and have found drivers notice slight drop in power (not loads) and bit exsive smoke from exhaust(night drivinging with a close vechical behind will pick up when looked in rear view mirror) what happens is turbo puts pressure into the engine oil gallery causing increased preasure blowing oil from seals, company recomended change turbo first, my garage did and NO MORE OIL LEAKS AND FULL POWER RESTORED, STEAMED CLEANED ENGINE BAY AND UNDERNEATHE 1000 MILES AGO AND NO MORE OIL LEAKS, USE GOOD FULLY SYN ENGINE OIL AND LET OIL GET TO TURBO BEFORE DRIVEING OFF,AND WEAR KEEPED TO A MIN.
ian lazenby, September 2010