In the latest episode of The DL, host Tyler Robertson is joined by Steve "Jr." Stratton from Diesel Emissions Service (DES). DES is a family-owned company that specializes in Diesel Particulate Filters, retrofitting, and DPF Cleaning. DES has several locations in California, including Ontario, Redding, Sacramento, and San Loredo. They also have facilities in Portland, OR and Vancouver, BC. Their brands include Filtertherm, Redline Emissions Products, and FilterTrack.