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Is Cow or Bat Urine Really in Your Diesel Exhaust Fluid?

Rumors that diesel exhaust fluid (DEF) contains urine, supposedly collected from cows or bats, have circulated for years. We at MotorBiscuit set the record straight in 2019. However, a recent article concerning diesel emulsifiers in Science Direct will likely lead to a resurgence of the rumor linking animal urine and diesel engines.
The PaxPower GMC Sierra Jackal on a dirt road

GM Drops 3.0-Liter Duramax Diesel

GM is supposedly dropping the 3.0-liter "baby" Duramax diesel engine over supply issues. But since there has not been any official response from GM there is no information as to how long this will be. Or is it permanent?
A sign for truck diesel in yellow with black writing with a red sign above that with a white truck and trailer silhouette.

4 Reasons a Diesel Truck Is Wrong For You

Diesel trucks have a long-standing reputation for providing more power, reliability, and towing capabilities, but this doesn't mean diesel is always better for everyone. There are actually several reasons why a person may not benefit from what diesel trucks provide.