Hi everybody. My Terrano, 1998, 2.7TDI has started emitting whiteish coloured exhaust smoke. This is normally at its worst when I leave it ticking over for a few minutes and then rev the engine. It has also developed an engine mis-fire.:nenau:nenau:nenau When i'm driving it I cannot see any exhaust smoke and cannot notice the mis-fire. Would a fuel additive help and if so which is the best. Regards Wadey.