What is Clean Diesel Vehicles ?
Diesels vehicles are cleaner because of the combination of cleaner fuel and newer technology. The emissions treatments were not usable in North America due to lower quality diesel fuel until the switch to ultra low sulfur diesel (ULSD). While the law requires this by Dec 2010, all refineries switched over a while time ago. This is why some retail fuel stations still don't have the USLD sticker on the pump. The current emissions systems would fail if the were used with the older low sulfur diesel fuel. They still sell low sulfur fuel in Mexico so be careful if you travel south of the border (or south-south of the border if you're from Canada).
Emissions are treated in an oxidation catalyst (catalytic converter), then a particulate filter (DPF), then a DeNOx catalyst with Adblue fluid. The Adblue fluid lasts up to 10,000 miles in the VW Touareg TDI and up to 10-15,000 miles in the Audi Q7 TDI. The Touareg has a 4.5 gallon (16.9L) tank and the Audi Q7 has a 6 gallon (23 liter) Adblue tank. The Touareg adblue reservoir is under the spare tire. In the Audi Q7, the filler cap is located next to the fuel filler cap and can't be removed by hand to help avoid misfueling and the 2 tanks are somewhere under the car. You can use the lug bolt wrench to loosen the cap.
1500 miles before the Adblue runs dry, the car will give a warning. If you continue to ignore the warnings and run it dry, the car will not start! This is because without the urea injection, the car will not meet emissions. While the engine won't shut down by itself, it won't restart after you shut it off.
Emissions are treated in an oxidation catalyst (catalytic converter), then a particulate filter (DPF), then a DeNOx catalyst with Adblue fluid. The Adblue fluid lasts up to 10,000 miles in the VW Touareg TDI and up to 10-15,000 miles in the Audi Q7 TDI. The Touareg has a 4.5 gallon (16.9L) tank and the Audi Q7 has a 6 gallon (23 liter) Adblue tank. The Touareg adblue reservoir is under the spare tire. In the Audi Q7, the filler cap is located next to the fuel filler cap and can't be removed by hand to help avoid misfueling and the 2 tanks are somewhere under the car. You can use the lug bolt wrench to loosen the cap.
Here is a video showing how the adblue system works.
1500 miles before the Adblue runs dry, the car will give a warning. If you continue to ignore the warnings and run it dry, the car will not start! This is because without the urea injection, the car will not meet emissions. While the engine won't shut down by itself, it won't restart after you shut it off.
Below left is a pdf from Audi describing some aspects of the Adblue system on their Q7 TDI.
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