astmi Report post Posted August 10, 2012 My RV is pushed by an ISC Cummins 350 hp. The chassis is a 2004. I presume that the engine was built in 2003 or 2004. Since the sulfur content has changed after 03-04, would you recommend adding any fuel additive to compensate lower sulfur content? If so, which one? Share this post Link to post Share on other sites
hermanmullins Report post Posted August 10, 2012 astmi, Like the two Ladies talking about Saul dying. One asked, "Did they give him Chicken Soup?" and the other replied, "He's dead, it can't help." The first lady replied, "It couldn't HURT". The same applies to additives. It may not help but it can't hurt. Herman Share this post Link to post Share on other sites
wolfe10 Report post Posted August 10, 2012 The official position by ALL diesel engine makers is that ULSD is backward compatible with all their engines. In other words, no additive needed. I use two additives for specific reasons: If storing fuel for more than 2 months in the summer or 3 months in the winter, I add a BIOCIDE (from any marine store). If storing summer grade diesel into below freezing conditions, I add an anti-gel (from any Walmart). Brett Share this post Link to post Share on other sites
astmi Report post Posted August 11, 2012 Thanks guys Share this post Link to post Share on other sites
