Its a slightly heavier grade Brian, but not really different from auto 20W50. It has extra Zinc and other good stuff hor the harder working diesel engines,it has the effect of quieting the gear box and tappets. As its a harder wearing oil, its perfect for the STs inb heavy traffic and long runs. The oil lasts longer, so there is no increase in noise and the dreaded 1st to 2nd notchyness that the other oils exhibit. The standard filter (Repco ROF135 or Ryco equiv) are fine.