Magnetorheological (MR) grease based on mineral oil, silicon oil, and polyalphaolefi was prepared directly by synchronizing with synthetic grease, respectively. The oxidation stability of each was measured using a pressurized differential scanning calorimeter, whereas sedimentation stability was evaluated by the natural settling process. The effects of base oil and magnetic field strength on MR response of the suspensions were investigated via measurement of the rheological properties, including storage modulus, loss modulus, and MR effect under dynamic oscillation test. It was confirmed that ethyl silicon oil–based MR grease has excellent oxidation stability, good sedimentation stability, and outstanding MR effect. In addition, the MR grease exhibited characteristics of a solid state both with and without magnetic field.
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