I just got my shop manual today and did the oil change, all 3 holes. I changed the oil filter also. When I checked the engine oil, the tank is slam full !!! The manual said add 3.5 quarts, which is exactly what I did, but it is full, right up to the bottom of the filler neck at the top of the tank??? To head off the obvious questions, yes, ALL old oil was drained, no I didn't add any oil to the filter before I installed it. Any ideas why it's so full?