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Ask The Mechanic
Mon Jul 6, 2015 01:42 PM CDT

Q: Both my newer diesel tractor and pickup have all the emission-control devices on them, including the DEF (Diesel Exhaust Fluid) tank. However, I have a friend who has a Volkswagen car that does not use DEF or have to go through all of that “regen” routine, with the light on the dash coming on and the area around the vehicle getting hot enough to fry an egg. How did VW and German engineering get by without using all of the emission-standards I have on my diesel truck and tractor?

A: On the ...

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