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Old 07-22-2013, 05:44 PM
tjts1 tjts1 is offline
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Join Date: May 2009
Location: The slums of Beverly Hills
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Quote:
Originally Posted by zakkkk View Post
Interesting note was that VW/Audi has the only 4 cyl diesel that is 50 state legal WITHOUT needing the urea tank system.
Better engineering ?
jz
No, non urea diesels are cheaper to manufacture at the expense of reliability. New diesels that don't use urea rely on diesel fuel injected directly into the exhaust or during the exhaust stroke to burn off the soot from DPF. They go through rich regen cycles. This increases fuel consumption and and kills exhaust valves in the long run.

Jetta without urea
Fuel Economy of the 2013 Volkswagen Jetta

Larger Passat with same engine/trans + urea.
Fuel Economy of the 2013 Volkswagen Passat
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Last edited by tjts1; 07-22-2013 at 10:38 PM.
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