DHerzog,
The Charles Rivers Associates/Baker and O’Brien (CRA/BOB) study done for the American Petroleum Institute (API) estimated a shortfall of 320,000 barrels per day when the regulation is introduced in 2006.
All dispenser pumps must be labeled based on U. S Environmental Protection Agency (EPA) guidelines and indicate the sulfur level and designation of the fuel. For example, any dispenser with S500 (500 ppm of sulfur) diesel fuel must declare that the fuel is not suitable for fueling model year 2007 and later vehicles.
All on-highway heavy-duty diesel vehicles manufactured in model year 2007 and later will be required to use S15 (ULSD) - See FAQ "Why is S15 (ULSD) required?" These vehicles will be forbidden to use diesel fuel with sulfur content greater than 15 ppm (parts per million). Some 2007 light-duty and passenger car vehicles will also require S15 (ULSD).
Vehicles not specifically designed for use with S15 (ULSD) may use either S15 (ULSD) or S500 (500 ppm) diesel.
Model Year 2007 diesel engines will be required to use high-efficiency catalytic exhaust emission control devises (or comparably effective technology).
On-highway diesel fuel sulfur levels be < 15ppm starting in June 2006.
We are not sure whether the transition to S15 (ULSD) in 2006 will affect fuel system elastomers (e. g. , O-rings). Any change will depend on the o-ring material and age, as well as the change in seal swell characteristics of the particular fuel being used, relative to the fuel the vehicle has been using. Experience in transitioning to S500 (500 ppm) in 1993 suggests end-users should be proactive. Specifically, maintenance records should be reviewed to ensure that fuel system elastomer seals have been changed out at recommended intervals with recommended materials.
In general, the processing required to reduce sulfur to 15 ppm also reduces the aromatics content and density of diesel fuel, resulting in a reduction in energy content (BTU/gal).
The expected reduction in energy content is on the order of 1% and may affect fuel mileage.
Makes me glad I am burning B100, filled up the other day for $2. 35/gal. Sometimes it's higher than #2 but I don't mind it at all due to my money staying at home.