First noticed this knock at about 500 miles... Let it go until 1500 miles... This happens under slight load. Changed oil and filter with 0w20 mobile one. Still very noticeable. Took it to the dealer and had a lead technician listen to it.. He seemed concerned. Service writer listened to it and looked at me and said....That sounds like its in the lower end. They kept the truck and contacted Honda and explained the issue. They checked the things they were told to check... Told me they drove a new truck on the lot and it made the same sound....????? I trust the Dealership but this knock does not seem right... I called Honda Customer service and was told it is what it is... I would like to know if any one has this same concern. I love my new Ridgeline. It is a pre retirement gift to myself... I traded my 08 Ridgeline in on it... Right now i'am not sure that was a good idea... I pulled my trailer for the first time today,and it really talks to you with this load on it. PS I have been a Mechanic for over 45 years....