You need to refer to your owners manual. Some years of Honda/Acura are approved for 4 down, some are not. My 2005 MDX and 2006 CRV are approved when the proceedures are followed. If yours is approved, consider changing the trans. fluid every 15K miles. You only need a drain and fill, no flushing or filter change. Use only HONDA FLUID. It should cost $60-$80 parts and labor. It's a very easy DIY project, but the filler bolt on the top of the transmission can be very stubborn, so free it up BEFORE you drain the fluid. 1/2 inch drive 17mm socket is the usual tool with an extension and breaker bar. The drain bolt is a 3/8 inch square drive.
2008 Itasca Meridian 37H & 2015 Flagstaff T12RBST
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months - Woo Woo
Yellowstone Lake 6-1-2012