Season 1 Episodes8
Cast2

David Sparks
Heavy D

David Kiley
Diesel Dave
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Ranked #2 of 8 in Season 1•+0.4 vs season avg
A client asks Heavy D & his crew to turn his beat-up work truck into an off-road mobile service station. Heavy D searches for the next giveaway truck, & Diesel Dave finds the Holy Grail: a 2nd generation, quad cab Dodge with a 12-valve diesel

David Sparks
Heavy D

David Kiley
Diesel Dave
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"The Hole-y Grail" is episode 5 of Diesel Brothers season 1. It scored 8.5/10 from 14 votes, ranking #2 of 8 episodes this season (season average 8.1). It aired on February 1, 2016.