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I run shell rimula r4x 15w40 change oil every 10000km 93 model gq with 440000 on clock runs like a dream no oil topups between changes and motor is not sludgey like i have seen with some customers cars running other oils. Usally once they switch after two or 3 changes using rimula the motor gets cleaner. Have also had a few customers comment that their cars run a lot smoother after the change.