The term "zero tolerance" is often loosely applied to engines, and usually implies very tight manufacturing tolerances and a need for precise maintenance. While the Chrysler 3.0L engines do require proper maintenance and have relatively tight tolerances compared to some older designs, they are not built to the extreme precision of what would be considered a true "zero tolerance" engine (which is a rarely used and technically ambiguous term). There's no official Chrysler designation of this engine as "zero tolerance".
