Original Diesel is the mother of Sour Diesel. It has also been known as Daywrecker, Diesel #1, Headband, etc. It is the original Headband (the cuts on the west coast are different and are a OG Kush x Sour Diesel cross).
All i know is the ECSD that i seen all around the last few years is NOT the same sour diesel i used to get around 02/03/04. That shit was pure lemon gasoline. First taste was all lemon, then as you exhale you get this undertinge of gasoline. Shit was fucking ridiculous. Ive grown out tons of ECSD all vouched and vouched and vouched and none of it reminds me at all of the SD from years ago.... man i would sacrifice my first born for that legit lemon diesel cut.... IMO blew all this ECSD shit out the fucking water...