Did I mention that DEF has a shelf life of about 12 months?
If incorrect ("poor quality") or old DEF is detected, vehicle speed is limited to 55 MPH after 200 miles. Failure to remove the "poor quality" DEF and refill with proper DEF will limit vehicle speed to 4 MPH after two fuel tank refills.
According to GM, a "full tank of DEF (about 5 1/2 gallons) provides a driving range of about 5,000 miles (2500/3500 Series Duramax), less if towing or operting at high speed.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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