Engine Rattling And Whining Sounds problems of the 2014 Volkswagen Passat

•miles on car at failure: 21,755 •corrective actions from dealership: replaced turbo, gaskets, reflash, check particulate filter and replace. •outside air temps at failure:20’s – 30’s •failure warning signs, if any: turbo began making horrible whining sound on Sunday afternoon March 8, 2015. Called vw 3/9/15 and took to dealer 3/10/15 for emergency appointment prior to 3/12/15 first available appointment. No warning lights or indicators even after 3 days of driving with horrible noise. •warning lights on dash/mfi: no lights or indicators •problems since replacement: now at 25,766 miles. Checked oil cap to change oil every 5k instead of 10k now that out of service contract and noticed particles around oil cap. Got magnet and found that many were magnetic. I have videos of the turbo whining before replacement and the magnetic particles identified last evening. Oil was not changed as part of turbo replacement nor were the high pressure lines to/from turbo. Prior oil change at 19,146 for 20k service. No particles around or in oil cap after that service. Turbo occasionally makes a distant whining noise upon startup but stops within a couple of seconds. •did the dealership perform all maintenance and on schedule: yes (2 different dealers for maintenance. One did 10k and turbo, the other did the 20k). •if not dealership, what oil was used/miles on oil: oil was not changed as part of the turbo failure/replacement. Oil lines were not replaced either. 5w40 was used for 20k service at vw dealer prior to turbo failure. •do you interrupt dpf regenerators: try not to as most times I can smell the regen and notice the higher rpms and will continue driving. Have interrupted a couple that could not be avoided due to paying to park in a garage for work.