Diesel Myths, Maintenance & Mega Horsepower: RG Diesel Talks DEF, Deletes, and Building Boost In this episode of Hotrods and Hijinks at LilyJack Customs in downtown Greeneville, the hosts interview Justin and Meghan Lyons, owners of RG Diesel in Greeneville, Tennessee, a family-run shop opened in 2019 that services light-duty diesel trucks (Cummins, Duramax, Power Stroke) from oil changes to engine builds, suspension, and lifts. They discuss recurring industry problems like poor parts quality, locked-down vehicle programming data, and parts shortages, then explain diesel basics including high common-rail fuel pressures, cetane, ultra-low sulfur fuel lubricity issues, and block heaters. The conversation covers dyno events and extreme horsepower, rolling coal and EGT risks, longevity driven by maintenance, common failures like 6.0 Power Stroke ...