Television July 30, 2018 Biggest Build Yet? Diesel Brothers Take on Monster Project in Season 4 Premiere Discovery “Extra” has an exclusive sneak peek from the “Diesel Brothers” Season 4 premiere! It looks like Heavy D, Diesel Dave and the crew are taking on their biggest project yet… a monster school bus! The bus, which features a 40-foot drive train and 66-inch tires, will transport event-goers to an island in the middle of the Great Salt Lake in Utah. Watch the video for a first look at the build! “Diesel Brothers” returns to Discovery on Monday, July 30, at 10 p.m. as part of Motor Mondays. #Television More See How the Diesel Brothers Are Helping Victims of Hurricane Harvey The 'Diesel Brothers' Stars Dish on Father’s Day and Their Upcoming MLB Special!