has anyone got advise on smoking engine :roll: blue smoke and oil going down rapidly. things people have guessed at; head gasket, turbo, crank case compression, rings, its down on power but then it will pick up again for a bit :roll: i have cleaned the air intake around the intercooler pipes etc which was gunged up about 1/4" thick. cleaned the valve thingy where the exhaust gases come back into air intake.....oh sorry forgot to say its a 2002 td4 73,000 miles 8-[