Did you completely drain the oil from the oil pan, and refill it? I just recently filled my 320 with 8 quarts, and had to add another after starting the engine to replace the quart in the filter. I think you have a dip stick problem. I can't tell you whats wrong from here because I can't see it. You say you started the engine after a long sleep, maybe there's a build up in the pan, check all your options.