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> Cali switched in '06, the rest of the US switched in '10 The EPA mandated ULSD for all vehicle model years 2007 forward. By 2006 essentially all over-the-ro
by jhayward 11y ago
> Cali switched in '06, the rest of the US switched in '10
The EPA mandated ULSD for all vehicle model years 2007 forward. By 2006 essentially all over-the-road diesel sold in the US was ULSD. Otherwise all those catalytic converters would have been toast.
- paulmd 11y agoAll new vehicles, but the fleet doesn't turn over instantly. You could still buy the old No.1 or No.2 Diesel for your old engine for a couple years before it was phased out entirely. You would have been stupid to do so, of course, because the new stuff was the same price, was cleaner, and probably ran better too. As time wore on, it did get increasingly hard to find - my local gas stations all converted right around 2007 and immediately stopped carrying the old stuff. But if you were running a fleet that fueled up at your company depot or something, you may well have been buying No.1 or No.2. It's not an ironclad rule, just a guideline of where you should apply a little extra scrutiny. There were studies of what ULSD could do that predate even 2006. But until 2010 I would look carefully at methodology, anything that just says "diesel" without elaborating may be looking at ULSD, No.1/No.2, or perhaps the vehicle fleet (which consisted of a mixture of both).