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Jeep Grand Cherokee Multiple Displacement system must use correct 5W-20 oil

 
Jeep Grand Cherokee Problem
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Model Years Affected: 2005, 2006, 2007, 2008, 2009, 2010

Engines Affected: 5.7L V8, 5.7L V8 HEMI

Average Mileage: 77,500 mi (65,000 mi - 90,000 mi)

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Vehicles equipped with the multiple displacement system (MDS) must use the correct 5W-20 oil in order to function properly.
  • Visitor, , 5.7L V8 HEMI, 90,000 mi

    05w 30 oil fully synthetic can be used but anything heavier will bring on the P01521 DTC code - now using 05w 30 with no problems

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  •  Rookie

    what is MDS? my06 grand Cherokee 4.7 oil level is sometimes high and sometimes low if I add oil when it is low I check it later and its over full does the MDS have anything to do with this?

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