2012 EX-L 5speed auto AWD. I had the sudder develop a few years ago. I replaced the transmission filter (not easy to get to) and did the drain and fill with Honda transmission fluid and Lube Guard Instant Shudder Fix and the shudder went away. Now I do a drain and fill once per year or about every 15K miles with the Lube Guard Instant Shudder Fix. I haven't had the problem for a few years now with this routine. My fluid come out nice and clean every year. Miine takes about 3.4 quarts on the transmission drain and fill. On my model the drain plug is really easy to get to when doing the engine oil change so not much extra work and only about $50 in materials per year to go this way.