I have a 2002 155BHP 2.5tdi. 105Kmiles. Don't mess with the engine output. If you mess up the gearbox, it will cost you £5K. Problems to date are. cv boot at 80Kmiles, indicator switch relay built into the hazard warning switch, twice replaced. brake switch at 90K. I get 40-44mpg. Lowest 39mpg best 46mpg. I worry about the multi gearbox failing and recently had the timing belt bolt failure although this may be my fault as I did the timing belt change 20K miles ago and possibly tightened the bolt too much due to a faulty torque wrench. During the diagnostics I found that I have camshaft wear which is worrying as I have always used 506.00 spec oil and changed it every 11,000 miles instead of 22K miles. looks like I will be replacing 4 camshafts next year. Any comment on camshafts?