I am also a new owner. Got a lot of questions but not this important. Drained oil in my 04 convertible. Only about 7.5 quarts drained. Filled it up and again only about 7 or so quarts filled it up to dipstick level. Obviously owner and also shop manual says 10 quarts. Crankcase is "level" all the way so I'm sure the oil was drained out. Help!