Multiple displacement system.
The 5.7L Hemi will drop down to 4 cylinders under light load to conserve fuel.
That the engine is running in MDS mode.
Dodge recommends 5w20 in the HEMI engines, because the higher viscosity of 10w30 can lead to inefficient operation of the MDS, or damage to the engine at hi revs while in MDS mode. It's always best to use the recommended weight of fluids.
Decreased mileage due to decreased efficiency of the MDS, and possible decrease in engine life due to increased viscocity affecting the MDS
Decreased gas mileage due to less efficient operation of the MDS, and possible decrease in engine life due to increased oil viscosity negatively affecting the MDS.
No, none of the SRTs of that era had active MDS.
For HEMIs: 5w20 weight oil to ensure proper operation of MDS.
Answer applies to MDS-equipped engines: Can you? Yes. Should you? Not really. Dodge recommend 5w30 because the heavier oils decrease the efficiencies gained from activating MDS, and can actually cause damage to the inner workings of the engine during MDS operation. The 3.5L does allow the use of 10w30, the 2.7L requires 5w30, while the 5.7L and 6.1L require 5w20.
5w-20 is recommended to ensure proper MDS operation. I highly recommend using a full synthetic oil.
any 5w - 30 oil. Use what ever the oil cap says. The Hemi with MDS requires 5w20 for example.
5w30 without MDS 5w20 with MDS
yes it is possible, certain programmers you can get will disable it, for more info about ur truck go to ramforumz.com
No