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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

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HEMI engines which are fitted with a Multi Displacement System (MDS) should use SAE 5W-20 according to the OEM. The OEM states that not using the recommended viscosity can cause the MDS to function improperly.

Note however that on various HEMI owner forums you can find that owners of vehicles which are fitted with the HEMI including the MDS are succesfully using SAE 5W-30 in warmer climates such as Florida or Arizona.
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