Today I had very little power from my engine and upon investigation found that turbo had virtually seized up. This car (Citroen C5 2007 1.6hdi),has done 105,000 miles with a full service history and for the first 80,000 miles oil changed at regular12,000 mile intervals - in the last 3 years I have had the oil changed every 6,000 - I've had new injector bolts fitted as a precaution along with new injector seals after one was starting to leak - in other words this car has been well cared for as I know from this forum what happens with these hdi engines. The good news is a new turbo fitted following manufactures instructions on fitting new turbo feed pipe and changing oil and cleaning pipes and sump and car is back to normal power - my old turbo feed pipe was still like new with no blockage whatsoever of the filter - no carbon build up in engine either. What I'm saying in a long winded way is that it's not always poor servicing or neglected oil changes that cause these turbos to fail it's also down to plain and simple age/wear and tear - the golf TDI turbos last around 110,000 - 130,000 before they fail they also are made by Garett. Nothing lasts forever no matter how well you look after it