Do you have questions about your buses or engines? Is there something specific you’d like to know about fuel economy? Are you curious about how you’ll be impacted by 2010 emissions requirements? We’re here to help, providing you with a source to get the information you need. Ask a question below and our panel of experts from industry leader, IC Bus, will respond.

Latest Q&A


I have not been able to find the total emissions picture for the new Paccar's PX-6 diesel engine. Having the profile in comparision to the 8.1 engine using natural gas or gasoline would be great.


The EPA database on heavy duty engine emissions is publicly available at under large on-highway engine, 2007-2008 model year.  The PX-6 is certified as Cummins engine family 7CEXH0408BAC.  You should be able to find the gasoline and natural gas engines emissions data in the same file. 


PLEASE NOTE: Your question must be pertinent to the areas of bus bodies, chassis and engines. All other questions will be disregarded.

The experts will attempt to answer as many questions as possible, but will not be able to answer every question submitted, depending on its relevance and similarity to previously submitted questions.

First Name  
Last Name  

Carl Webb
Carl Webb
Strategic Pricing and Financial Analysis Manager, IC Bus
Read more
David Hillman
David Hillman
Global Bus Marketing Director, IC Bus
Read more
Ramses Banda
Ramses Banda
Commercial Bus Marketing Manager, IC Bus
Read more

Q&A Archive


I’ve been using B10 in my 2001 cutaway buses, but would like to try higher concentrations of biodiesel. Is there any reason for me not to?


As long as users understand the risks of using biodiesel, take the proper precautions, and have a good quality source, the risks are low.  If you have been using B10 successfully over a period of time in your International engines, I wouldn’t discourage you from trialing B20.  Many fleets are running B20 with very few issues.

That said, International cannot expressly endorse blends higher than B5, because there are insufficient specifications for the blended fuel.  Use does not void the warranty per se, but if use of biodiesel is shown to be the cause of a failure, than that failure is the responsibility of the user or fuel supplier.  The same would be true in the case of failures caused by any fuel or additive.

Poor or inconsistent quality tends to be the number one problem with biodiesel.  We recommend that anyone wanting to use biodiesel seek out a source of supply that has BQ9000 certification from the biodiesel board.  The biodiesel board website,, is an excellent source of information on how to successfully use biodiesel in your fleet.


Are lubricity additives required with ultra low sulfur diesel fuel?


There is a minimum lubricity required by the new diesel fuel standard.  All on-road diesel fuel is required to meet this standard, so there is no need for individuals or fleets to add lubricity improvers to their fuel.  Removal of sulfur does reduce lubricity, but any necessary additives will already have been added by the fuel refiner or distributor.

To find out more about the bodies, chassis and engines of IC Bus brand buses, click here.


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