Hi, to cut a long story short, the W221 I have had the Turbo reconditioned from Essex Turbos (anyone used them?). They were the only place able and willing to do it. Since having the turbo re-fitted the car was still giving off a lot of white smoke, so sent to merc for a diagnostics who said needs a new turbo! And that the fuel injector is blocked, as well as the inlet manifold. They are currently going to fix the fuel injector, as essex turbos are adamant that the turbo is not leaking as they did all the tests and it is fine, that the smoke is due to the fuel injector blockage and excess oil. I am sincerely hoping the turbo is fine, anyone else had experience with this can offer some knowledge about recon turbos and fuel injector blockages?