I also have an Accent diesel & I observed that in the casa during a full oil change after they put in 5 liters, they start the engine, wait a while for the oil to circulate, shut it off then wait approximately 5 minutes or so for the oil to settle then refill to the proper level. After I check it in the morning, it's above the full mark. Most likely, there is still residual oil that hasn't settled in the casa when they refilled to the F. Try checking the oil a few minutes after shutting down & see if it is indeed overfilled.