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  1. List of Chrysler MS-12991 Engine Oil for the 3.0 EcoDiesel Jeep Wrangler

    Hello all. Just bought JLU Rubicon Diesel about two weeks ago. Great vehicle. I have been reading your thread about MS-12991 oil. Has there been any discussion about API- SN being a spark ignition designation ( S equals spark ignition - C equals compression ignition ). Rotella T-6 is API - CK4...