Wilsons Sandbox

Hi All, Well I really do hate to bring up the subject, but I gotta. I just changed the oil on my 2500 mile A13 for the first time. After a little ride around the neighborhood (read lake here), the damned thing would hardly shift into neutral. I hate to be a heritic, but I used Honda 20-50 oil. Any comments? It shifted into neutral on the first click before the oil change. Please note, however, it was second gear challenged with a big "clunk" on many shifts. It does seem to shift into the gears better now. Please give me your observations and comments. Thanks, Jim