This BMW E65 has a 3.0-litre diesel engine and arrived with ECU software modified at another workshop. The owner reported problems with how the engine ran. The inspection found that the EGR system had not been fully disabled as claimed, and the DPF was damaged and restricted.

During the work, the DPF was removed and the exhaust modified; the ECU file and EGR settings were also corrected. With the previous file, the car recorded 260 hp and 538 Nm. After the new calibration, the dyno recorded 308 hp and 632 Nm.

Blue smoke remained during testing. This can indicate oil entering the exhaust, and the video identifies turbocharger wear or a crankcase ventilation issue as possible causes. The software work did not resolve this mechanical concern; the turbocharger and oil system still require separate inspection.