One way to avoid turbo failure is idle the car for some seconds before shutting off. Turbo spins at very high revolutions and if shut down abruptly (without idlying or slowing), oil flow is intruppted. Without oil that cools and lubricate moving parts, the turbo remain hot, and heat warps metals, and thereby bringing their demise. The same rule applies when you start to move. After starting, idle for few seconds and then pull of gently to the freeway speed. You do not have to put stress on turbo by flooring the pedal. Flooring effect is same as that of an impulse. The key rule is "keep gentle". However, if you are cruzing at 70 mph and hear weired noises, slow down, idle the car, open, hood or bonnet, investigate the noise area, and then shut down. There will be turbo failures when they are exposed to high temperatures, vibrations, and foot stress of the driver. Also it is prudent to clean the turbo vanes periodically. There is instruction for this on this forum somewhere. If you wish to emove the turbo problem forever, all you need to do is remove the turbo and seal to cavatues, making sure that there is passage for the exhaust to reach tail pipe. You will now have a not-turbo diesel that will be a little sluggist than before, pick-up time for 0-60 mph increased from 8 sec to 12-14sec.