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I am going to say 'blown turbo'. As I understand it, they needs replacing every few years. They are susceptible to heat and incredible revolutions. They have to be lubricated, the seals go, and you get smoke.
No. engine mounts, electrics, ecu, axels and a whole lot of other stuff would need to be changed and cut and welded.even after that you could have a host of other difficulties. not an easy task for even the experienced engineer.
type in the computer AMETECH they have restore oil and various other products you can buy for just this kind of thing. about £7 oil adertives to clean the engine or ADDERTIVES TO CLEAN THE FULE LINE. WORTH A TRY. WORKED FOR ME.
This is quite a common problem,especially with the 2.2 dci engine,although as usual Renault wont admit the problem.The reason your engine throws the oil after a run and not when stationary is this problem is caused by the turbo pressurising the crankcase.You can rev the engine all day but when theres no load on it then the turbo is not working at full pressure and all is well. The cure for the problem is to fit a new rocker cover which incorporates part of the inlet manifold.The breathing system on these engines is complicated and the rocker cover has to handle both inlet gases AND exhaust gases and although no one can explain why a new cover cures it,I suspect the plastic the cover is made of is not robust enough and either becomes porous or warped and this allows gases into the crankcase,pressurising it and focing oil out either through the dipstick or it blows out the blanking plug in the timing cover. It is not a massive job to replace the rocker cover as long as the injectors come out easily.If they dont then youre in real trouble.Good luck,Duncan.