Audi Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for your question. My name is Steve and I am a fully qualified vehicle technician with over thirty years in the trade, hopefully I can help answer your question.
Your Audi has a DPF regeneration system which injects diesel into the engine on the exhaust stroke to assist in regenerating the DPF (diesel particulate filter) this normally allows a small amount of diesel to enter the sump and this thins the oil slightly. In normal use this is not a problem and when the oil is changed during a service all is reset.
If this DPF regenerating system is at fault it can over fuel the engine and this excess fuel cold then raise the sump oil level by a dangerous amount. This could then cause the problem you have of the engine throwing a con-rod and putting a hole in the block.
I hope this at least helps in understanding what may have happened, but do please ask me any further questions.
If this does answer your question please click accept and rate me, this allows me to continue.
Even after clicking accept I can continue to answer your questions on the matter.
Its not too common for the engine to get to the stage where it throws a rod and damages the engine, but the raising oil level is a problem on vehicles with a DPF, it is often recommended to check the level between services to ensure the oil level is not rising too much. I advise owners to consider have the oil changed done at a more regular interval than Audi recommend to prevent the degration of the oil due to the ingress of diesel.
As you have had regular servicing done by Audi they may consider a good will gesture if pushed.
Yes it would have blown out the hole when the incident occurred.
They would be aware that the oil level can rise due to the addition of diesel from the DPF regeneration system.
The emission issue involved a remap of the ECU to lower the readings at test parameters, the actual reprogramming software was never fully revealed, and many owners were reluctant to have the update carried out due to a fear it would lower performance. I don't believe the re-programming should have effected the DPF regeneration system, but the details were kept tightly under wrap and so i can not say either way.
If the update was carried out on your Audi I would consider that it may have had a detrimental effect.