I take care of my Honda gearbox, it is an original automatic gearbox and I always use Real Honda ATF Z1 and now DW-1 Honda Fluid. However, shifting from 1st to 2nd was a bit difficult when the car was COLD. weird, is not it? I drained a small amount of ATF because I didn't want to overfill. I started the engine and ran it at idle while it was idling like the instructions said. Then pour almost the entire bottle in Transmission. Then I went through gears 1 2 3 4 RN Park with my foot on the brake. Then I pulled out of the driveway and felt better straight away, I drove everywhere and came to a full stop, and I used to HATE having to make a full stop because of the hard shifting from 1st to 2nd, but that was rectified immediately . ALL ATP products work and ARE NOT SNAKE OILS. There ATP 205 Stop Leak are amazing, all their products will cost you the same and the only place you can find them is AMAZON and at a great price.