Twenty-five years ago, Rick Rubin, and Russell Simmons started Def Jam Recordings in an NYU dorm room. Today the label is home to some of the most influential and stylish artists in hip-hop and R&B.

I recently read a pretty startling statistic—in the next year, the off-highway engine market will consume about 20 million gallons of Diesel Exhaust Fluid (DEF). In the next five years that number is ...