Recent content by veeQfourD

To be clear, both oils are SAE 15W-40 viscosity grade with API ratings of CK-4/SN (Sunoco) and CJ-4/SM (Shell). The owner's manual specifies SAE 5W-30 with a minimum rating of API SM. I have been using Mobil Delvac 1300 15W-40 CK-4/SP for the last few years with good "seat of the pants" results...

High mileage VQ40DE baseline used oil analysis on a mix of Sunoco Super C 15W-40 (CK-4/SN) and Shell Rimula Super (CJ-4/SM). Mix was 1 gallon of Sunoco and 2 quarts of Shell to conveniently use my stash (I have gallon jugs of Sunoco and quarts of Rimula) over 3 short oil change intervals. This...