bakers909 Report post Posted May 7, 2016 What does everyone here put in their pre-2007 C13's? My wife and I purchased a 2006 Country Coach Affinity 730 that has a 2005 C13 in it. Do you just buy the ULSD at the Truck Stop? I've read so much about the ins and outs of the fuel in the older motors and am looking for some advice. Share this post Link to post Share on other sites
wolfe10 Report post Posted May 7, 2016 bakers909, Welcome to the FMCA Forum. No problem-- just pull up to any diesel pump (though I prefer not to use biodiesel). In writing, Caterpillar as well as Cummins, DD, etc all state that ULSD is backwards compatible with all their engines. Share this post Link to post Share on other sites
bakers909 Report post Posted May 7, 2016 Thank you Sir!! Share this post Link to post Share on other sites
