BMW Diesels, Turbo Failure and Repair

Over the last 15 years we have a huge shift towards turbo diesel engine'd cars. They can offer good power and torque figures whilst also returning superior economy when compared to the larger petrol equivalents.

Common BMW diesel models include:

  • 318d. 320d, 325d, 330d, 335d
  • 118d, 120d, 123d, 125d
  • 520d, 525d, 530d,
  • 635d
  • 730d
  • Across the range of X drive models ( X1, X3, X4, X5, X6)
  • We also see diesel engines fitted across the range of Minis 

Turbo charger technology and reliability has improved greatly over the years, however we do the see the occasional turbo charger failure. This can result in the car being off the road and costly repairs. A failed turbo can cause the DPF filter to block in engine oil escapes into the exhaust.

One of the most common causes that we see when removing failed turbo chargers is a blockage in either the oil supply line or the oil return line. - The blockages we see is in fact engine oil which has begun to solidify, known commonly as "sludge" or coking up. This is the process that happens when the oil has reached its capacity to absorb carbon ( which diesel engines produced in large quantities )

This pictures shows an oil return pipe blocking up with carbon. This turbo was removed from a 2009 120d N47 engine code - The DPF also became blocked on this car, requiring removal and cleaning. 
bmw turbo failure

The good news is there is a simple solution that can help you avoid this scenario occurring. Regular servicing at recommended 10,000 mile intervals. Replacing the engine oil filter and engine oil will keep the engine oil fresh and clean preventing carbon build up. The use of the correct grade of engine oil is also essential, some cheaper brands of engine oils are even more likely to cause problems. 

Our engine oil and filter changes using O.E filters and Castrol edge engine oil start at £99 including VAT.  this can be upgraded to include a Forte Engine flush for a total cost of £115.

An engine flush we help break down any carbon build in the engine and help ensure more of the old used engine oil is drained out during the service. 

For customers looking for that extra engine protection during a service we can use BG products, this is a duel treatment where BG EPR is added to the engine oil before the oil is drained, and a second BG product DOC is added to the new oil, this we provide extra protection and give the engine oil extra strength. BG DOC prevents sludge build up when used as part of regular servicing


More information can be found on the BG products website Here or on our own website Here.