Will S15 (ULSD) affect my fuel system seals?
The "Clean Diesel Fuel Alliance," an industry group consisting of oil and gas producers, engine manufacturers, the American Petroleum Institute (API) and others, states that "engine and vehicle manufacturers are not anticipating that existing [diesel engine] owners will have to make changes to their equipment to operate [on] the new fuel.
A small number of vehicles may require preventative maintenance in the form of upgrading certain engine and fuel system seals that may not perform well in the transition to the new fuel and could leak. Studies of test fleets have indicated that fuel system leaks are not exclusive to a particular engine type, fuel type or geographic region. It is anticipated that only a small fraction of the vehicles will be affected."
A leak in your fuel system can be dangerous, potentially causing fires to occur if diesel fuel comes in contact with hot engine parts. It is recommended that you consult with your vehicle manufacturer for advice about maintaining or replacing the fuel system seals in your vehicle.
Please refer to our technical bulletin Fuel Links from Seals of Vehicles using Ultra Low Sulfur Diesel for additional information.
http://www.chevron.com/products/prodserv/fuels/diesel/ulsd.shtml#A12
Today’s diesel powered vehicles feature low emission engines that are more susceptible than ever to diesel fuel related wear. Diesel engine designs are employing the use of higher fuel injection pressures, hotter fuel return temperatures, higher operating temperatures and complex engine geometry to control emissions. All of these factors result in increased fuel system wear and can shorten engine life.
With the mandate by the United States EPA to reduce the sulfur content of diesel fuels to control emissions, this has resulted the elimination of certain naturally occurring polar compounds that aid in protection of the fuel system from wear by forming a protective layer on the metal surfaces fuel injection system. The increased use of the hydrotreating and hydrocracking refining processes to reduce the sulfur content of the diesel fuel in order to meet the mandated sulfur content of 0.5% and the 2006 ultra-low sulfur diesel fuel specification of 0.05% causes these naturally occurring polar compounds to become either chemically altered or completely removed, thus resulting in increased engine and fuel system wear.
Uhuh So in other words its going to eat the seals out of your injector pumps.