I've got a 2008 Honda CR-V. First Honda automatic I've ever had. I've heard rumors and some anecdotes about ATF-Z1 not holding up as well as Honda would like you to believe, and that there was a rash of failures in the older 5-speed autos with V6 Accords and Odysseys. I tow a small pop-up camper occasionally, and the transmission has done fine; I keep it in D3 going up the hills, and try to not let the torque converter disengage. After nearly 15,000 miles, I noticed a groan going from reverse to drive, and a little whine shifting into second. The fluid looked OK on the dipstick, but there were some brown streaks on the paper towel wiping it off. I changed it, and instead of bright cherry red it was orange. Not much crud in the catch pan or on the magnet that I could see. So after 1 change of 3.5 quarts (interesting, the owner's manual calls out 2.7 for a change), the groan and whine are gone. So is 15,000 too long an interval? Supposedly the maintenance minder doesn't indicate an ATF change until around 60,000 miles. Or are groans and whines perfectly normal?