the father in laws s40 00>04 1.9tdi Renault engine is chuffing grey/white smoke and smells oil/diesel quite strong

has 187k on clock but has had headgasket done around a yaer ago with new turbo and not showing any signs of it again



it drives perfect and does not seem to be lacking any power

I have known the car for the last 9 years and its not had glow plugs and had a suggestion of and injector by a mate



the only thing I have done recently3 weeks ago but been fine up till now was clean the throttle body and valve underneath it out as was all gunged up



any help advice much appreciated