06-26-2007, 05:02 PM
ULSD was @ the pump 9/06 in California, 10/06 rest of the country. Production started early in '06, though some markets (BP/ARCO stations in California for example) have been dispensing ULSD for several years. Though only 80% of on-road diesel produced is required to be ULSD until 2010, almost all diesel being produced is ULSD since they are not going to run two production lines. There still are some stations with LSD, but they are few and far between.
It's not sulphur emissions, it's the particulate matter produced by the sulphur content during combustion. California and 4 other states have already adopted the regs that will be in effect countrywide for 2010. The current on-road diesel available in the US has a lower sulphur content than that of Euro spec fuel. In addition, US emissions standards are tougher than in Europe. NOx cats and DPFs are now required in the US. Reduced emissions, yet greater cost and complexity. Mileage seems to be taking a hit also, probably because the regen process dumps excess fuel to raise egts.
It's not sulphur emissions, it's the particulate matter produced by the sulphur content during combustion. California and 4 other states have already adopted the regs that will be in effect countrywide for 2010. The current on-road diesel available in the US has a lower sulphur content than that of Euro spec fuel. In addition, US emissions standards are tougher than in Europe. NOx cats and DPFs are now required in the US. Reduced emissions, yet greater cost and complexity. Mileage seems to be taking a hit also, probably because the regen process dumps excess fuel to raise egts.