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As far as i know the Mercedes DPF doesn't require a service.
2 important things you should keep in mind.
1: a proper oil grade with low ash, as Mercedes recomend.
2: drive with steady speed at 60 MPH as long as possible while you driving on motorway , this will clear/ clean the DPF.
A diesel particulate filter (DPF) collects particulates in the engine's exhaust, basically unburned fuel. Every so often the DPF will need to regenerate. What this means is when a certain amount of particulates accumulate in the DPF, a small amount of raw fuel is injected into the DPF to increase the temperature. The increased heat burns the particulates resulting in fewer nasty things going into the atmosphere. However, the regeneration process leaves a small amount of ash in the DPF which accumulates over time. You may have to have the DPF professionally cleaned (it's not a DIY thing) in order to restore its performance.
do you have an english translation for DPF ? i can tell you that your car is based on the passat platform(8E) ,a 2006 model(06)and made in Ingolstatd(A).043657 is the chassis #..the paper plate stuck to the boot floor has all the trim codes (blocks of 3 letters)and also the service ragime code.(SG 3/4)
the oil you got is fine,as the car uses more oil as it gets older the lower number should get higher (i.e. 5/30-10/40-20/50)that way you control the amount of oilburn.roughly a pint every 1000miles is about right.
The DPF is designed to be self-cleaning to a certain extent if the engine is run for a good length of time the deposits should burn off. I would kick up a fuss with Audi about the warranty, ask them to show its exclusion. Unless the DPF has become physically damaged by something you have done then they need to have it fixed as it is a result of the deficiency in their design. This is not like some damaged tyre, open to abuse by the driver, the DPF is integral to the vehicle operation and through no commission on your part it is not functioning as it should.
Exhaust pressure sensor a possibility if it has a DPF (diesel particulate filter). Has it had its fuel pump recall, the oil pressure light could be just the constant cranking and running the battery low.
Its a dpf not a cat.Easy way to clean out[regenerate]First bring the engine to normal temp bring up the rpm to 4000 for 2 mins,then allow to idle for 30 seconds then bring the rpm up to 3000 rpm for 3 mins and yourfilter will have regenerated [fancy word for clean itself out.
DPF = diesel particulate filter.Its important to use good quality low ash oil for your oil changes.