CD4E can be reliable if you treat it well, and by treat it well, I mean change the fluid every so often (I do mine every 6,000 miles for added protection) And as long as you maintain your 2.5L it should stay running for awhile, Although I personally think the 2.0L is more reliable, the 2.5L looks fun to drive, how did your last engine go out? Many Contour owners have good luck with their Contours, some just so happens to be a bad contour out there every now and then.