I inserted some information that Cummins sent someone from another web site regarding lubricity additives. Note that Cummins says that appropriate additives are included prior to being pumped into the vehicles.
----- Original Message ----- From: Powermaster@ cummins.com
<mailto:Powermaster@ cummins.com> To: Denny Filter Sent: Friday, July
13, 2007 1:37 PM Subject: Re: RQST00000495972
Thanks for your Email message. You have contacted Cummins, Inc. at our
Customer Assistance Center located in Columbus, Indiana. This is our
worldwide headquarters and has been our home since Clessie Cummins
founded the company February 3, 1919.
There are many rumors circulating about the effects of sulfur being in
diesel fuel or sulfur being taken out of diesel fuel. Diesel fuel
without sulfur is just as good, in all respects except one, when
compared with today's fuels with sulfur.
The only negative effect of taking sulfur out of fuel is that the fuel
becomes more expensive, somewhat negating the inherent cost advantage
of running diesel engines when compared to other fuels. It has to be
removed using specialized equipment and chemical processes that add to
the expense of producing the fuel.
We have seen a very few instances where the reduced aromatic content of the fuel has resulted in slight leaks from fuel systems. This is not expected to be an issue with many engines.
Diesel fuel, in the United States, now must meet a lubricity standard. The producers adjust the lubricity before they distribute the fuel. No further additives are needed to ensure proper fuel system lubrication.
Basically the change to new fuel should be pretty easy for folks with
the engines built prior to 2007 and for customers with the engines
built in 2007 it will be necessary, for the time it takes fuel stations
to consume the remainder of the old fuel, to be certain they are not
fueling with the older fuel.
There is an effect on diesel engines from the use of ultralow sulfur
fuel which we expect to be positive. The blowby gasses that normally
pass through the engine crankcase will contain much less of the
chemically reactive sulfur and its compounds. This will tend to keep
the engine oil cleaner during operation and allow important engine
components like bushings, bearings and piston rings to live longer.
Diesel fuels containing sulfur or no sulfur each have the same specific
heat, about 20,000 BTUs per pound. For that reason they give the same
amounts of work for the same amount of fuel. That means the fuel
economy per gallon will not be affected.
Over the years we have seen fuel economy decrease, somewhat, as diesel
engine designs have been modified to meet the lower NOX limits imposed
by government. This has been totally unrelated to sulfur in the fuel.
With lower sulfur fuels it is possible that some exhaust after
treatment devices (catalytic converters) may be used to better effect,
making it possible to further decrease harmful exhaust emissions.
If you use diesel fuel that does not meet the new federal low sulfur
requirements that are going into effect for 2007, in a 2007 vehicle
that requires the new fuel, it will produce particulate matter that
will cause rapid plugging of the exhaust particulate trap.
We thank you for your interest in Cummins products. We occasionally
misunderstand a question. If our answer to your communication looks
like we have misunderstood your e-mail please reply with further
To locate the nearest Cummins-authorized Dealer or Distributor Service
Provider use option #2 on our toll free customer assistance line
1-800-DIESELS (343-7357) or for computer assistance in locating a
Service Provider, use Cummins Service Locator, which can be found on
. com/ServiceLocat or/jsp/controlle r.jsp?action= showworl\
. com/ServiceLocat or/jsp/controlle r.jsp?action= showwor\
Please let us know if you have other questions and if away from your
computer or have a time-critical request that needs more urgent
attention, feel free to call us toll-free (from North America) at
option #4 on 1-800-DIESELS (343-7357).
Cummins Email (via webpage):
. com/cmi/content. jsp?siteId= 1&langId= 1033&menuId= 6&ove\
. com/cmi/content. jsp?siteId= 1&langId= 1033&menuId= 6&ov\
erviewId=33& menuIndex= 7>
Customer Assistance Center
Columbus, Indiana, USA