Re: Cummins & Eaton Joint HD Truck Drivetrain Reply #25 – March 15, 2013, 05:53:09 pm No idea about the world vs D.E.F. and Cummins, but I purchase my D.E.F. from Cummins a lot cheaper than anyother place I have checked. 2.5 gal $9.00. vs $14.00 to $19.00 eslewhere.I need about 2.5 gal every 7.500 miles, so not a biggie.Use it in the 2011 Ford F350 SRW 4X4 6.7 Power Stroke which is far better engine than the 5 Navistar engines before. Just ordered a 2013 F350 SRW to replace a 2008 Ford E250 work van that is well used and too light and small plus many miles and no 4X4.Dave M Quote Selected