As some of you know I have been restoring a 23' Proline and installed an '04 250hp DI Ram Injection motor. I considered using Amsoil in place of the HD 100 but after checking prices and reading these boards I chose to stick with the HD100.
However I did decide to run the Amsoil LU gear lube. I am a firm believer in syntheic oils and run it in all of my vehicles so I am well aware of the qualities of the oil. However I never expected results like I have gotten with this latest change. With the factory installed oil I was getting a GPS speed of 45.6 mph, with a 17 pitch prop and turning 5900 rpm. With the gear lube change the boat ran 47.8mph with the same prop but this time it turned over 6000, not sure what it would turn since I would not let it run over that. I ran the boat both times on a large lake with no current and there was no wind either time.
The results are even more startling when you consider this. When I first tested the boat it was bare, no windshield, no seat( we just stood behind the leaning post) no boarding platform. With the amsoil run I had installed the windshield, installed a 44" wide leaning post, and a swim platform. Very pleased with these early results!!