Chrysler’s MDS, or Multi Displacement System, was only available for the 5.7-liter HEMI in vehicles produced in 2005 and later. If you’re wondering if your late-model 5.7 HEMI has MDS there are a couple of ways to tell. First, if it’s equipped with a manual transmission, it doesn’t have MDS. Another potential indicator is the ECO light illuminating on the instrument cluster when cruising on a level or downhill road at highway speeds. The absence of the ECO light
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