I discovered my 2004 had one 4 years ago when I noticed a couple drops of tranny fluid on the driveway. The filter was so rusty that the fluid was seeping out. So I ordered one and got the proper ATF from my local Honda dealer and did a drain and top off along with the new filter. It shifts better then ever now. Honda service said there's is no service interval but will replace when it does rot through or there are shifting issues.