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Hello All,

I am interested in both the 2011 Jetta Wagon and the Audi A3. In reviewing the specs and taking with both dealers (mistake:D), I cannot find a good answer as to why Audi uses Blue urea treatment and VW does not in their basically identical engines???

It seems the exhaust systems and various filters/cats are the same... Why does Audi add the urea??

Also, why is VW engine oil capacity one more qt than Audi?

I have reviewed the excellent FAQs of this forum, but could not find an answer.

Thanks,

BudK
 

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Technically, the engine is not the same. The Audi A3 TDI uses the CBEA engine which was also used in the 2009 Jettas. All other models and years use the CJAA engine. http://www.myturbodiesel.com/forum/...cjaa-cbea-engine-audi-a3-golf-jetta-tdi-2880/ Here is a list of differences which I've found.

Like cloudysulphur said, no 2.0L engine uses Adblue fluid. Here is a FAQ article which explains more about the system. The 3.0L engines which do use Adblue are in a different FAQ article. http://www.myturbodiesel.com/1000q/DPF-Adblue-FAQ-VW-Audi.htm

Also, the fuel filter for the Audi A3 TDI is totally different from the VW styles. I have no idea why. Pics:http://www.myturbodiesel.com/1000q/a5/2009-2010-VW-TDI-fuel-filter.htm
 
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