Just changed oil and filter for the first time yesterday. Using Amsoil XLM 5W-20 and Amsoil Ea15K13 filter. What a TINY filter! It's not much bigger than the filters I use on my lawnmower engines. Can't go much bigger in diameter due to clearance, but there is plenty of room for a longer filter. Has anyone found an oversize filter for this engine that has the appropriate specs? Already did some searches, but have not found any solid answers yet.