white smoke in a diesl indicates water blue mix with black indicates burning to much oil .to do the turbo unit i would get some one to confirm it if u can then go to e bay or the sprts car breaker and get a second hand turbo unit for about 40 to 50 pound then get some one from the garage to fit as a homer.u could get a second hand full engine for about 300 pounds then about 100 to 150 to get some one to fit it all in about 450 pounds renult are having a laugh and only want ur money nothing else.i know of a situation that renult told a friend that there car needed a silinder head gasket replace for a few hundred pound i taken them to my mates garage and it was only the valve that circulates the water from the raidator and fixed it for 20 pounds lol
george nixon, September 2009