I also have a 2006 Itasca Ellipse with a Cat C7 and bought it used with 16900 miles in 2017. Just lost the engine. It appears a piston ring broke and scored the number 3 hole real bad. The coach just went over 24K miles. Not impressed with Cat engines to say the least. They’re putting in a reman engine vice rebuilt but my tab will also be $21K.