thanks for all your replies so far havent been able to spend much work time on it due to other cars etc much debate and theories though.most popular is turbo leaking oil from exhaust side of impellor ,fits the symptoms but dont really know how to test for that problem other than a specialist which means removal and probable expensive exchange/repair if nothing conclusive is found.second theory is dpf/cat is blocked giving high pressure guage/sensor readings. vehicle tries to regen by secondary diesel injection after combustion injection which goes as vapourised fuel into the hot exhaust.car cant burn off and unblock the dpf possibly because glow plugs arent working hence white smoke and oily (diesel)residue.this one is probably the easier and cheaper to prove/disprove as it only involves time and knowledge .only problem is lack of knowledge.i have tried scoping the injectors at the ecu using picos automotive settings and current clamp and although i get some form of pattern when i run the car i dont know how to evaluate it and am uncertain how to post it on here.if any one thinks this theory holds any water could i have there thoughts on what the scope pattern would look like and maybe a description of how to evaluate it please