My 2005 Ford Mondeo 2.0 TDCi has done 147,000 miles. It had a previous issue where the glow plug light would flash and it would go into limp mode. I read various posts on here and it seemed that the arm from the actuator to the turbo wasn't moving freely. I used a turbo cleaner and it seemed to do the trick. The warning light disappeared but afterwards there was a lot of white smoke. I did a long motorway run, the smoke stopped and it was running fine. However, later that day the smoke was back and then disappeared again while driving. This problem happens whenever I start the car, what could be the cause?