Davidkessler Report post Posted March 17, 2017 I have an ISL 425 Cummins engine and it regens every 1000 miles. Is that within range or excessive? I have no check engine lights. Share this post Link to post Share on other sites
manholt Report post Posted March 17, 2017 David. Welcome! I have the same engine, it's a 2009. Mine goes off about every 4,000 miles, Not knowing what year yours is, I can't say if a 07 or 08 has the same span as mine, but it does seem a tad excessive. Have you checked with Cummins? Carl Share this post Link to post Share on other sites
wolfe10 Report post Posted March 17, 2017 David, Welcome to the FMCA Forum. Does seem excessive. But call Cummins with your engine serial number for their advice: Cummins 800 343-7357. Share this post Link to post Share on other sites
