Jarlaxle
Senior Member
Well, I think it can now be called a trend...we have three 7.2 litre C7 diesels at work, powering box trucks (a 2005 & a 2007 Freightliner, a 2005 Sterling). Two have already been replaced (one due to a dead cylinder, one due to a bottom-end problem caused by a cracked cylinder head), the only survivor powers my truck, a 2007 with 129,000 miles. Judging by the blowby (clouds visible anytime I stop, smoke from the exhaust when accelerating or climbing hills), mine might not be long for this world. Per a mechanic at Ryder (which has thousands of C7's), "150,000 miles in a is about it for a 7.2 Cat. That's when they lose compression."
