1.6 HDi Turbocharger Oil Starvation from Carbon Sludge
SeriousEngineThe 1.6 HDi 16-valve engine (DV6TED4) has an oil capacity of just 3.85 litres and utilizes a miniature wire mesh gauze filter inside the hollow banjo bolt supplying oil to the turbocharger bearing core. If oil service intervals are exceeded or incorrect oil grades are used, carbon sludge builds up rapidly. The banjo bolt filter gauze clogs, starving the turbo bearing of oil. The turbocharger bearings overheat, causing high-pitched whining, shaft play, and sudden turbo failure. Replacing the turbo without removing the gauze and performing complete engine flushing causes immediate repeat failure.
High-pitched siren-like whining noise from engine bay during acceleration, Sudden loss of turbo boost power accompanied by black or blue exhaust smoke, Engine management warning light illuminated and vehicle entering limp-home mode, Excessive end-float or radial play in turbocharger compressor impeller wheel
- Listen carefully for high-pitched turbo whine when revving engine between 1,500 and 2,500 rpm
- Examine service history to confirm oil changes occurred at least every 10,000 miles using correct PSA B71 2290 low-SAPS oil
- Check whether the banjo bolt oil supply filter gauze has been removed in accordance with PSA technical service bulletins