Go with ams oil I use to talk mad shit about the product but honestly I’m pretty satisfied with it because Harley’s syn 3 is just become trash leaving lifters ticking on and the bike has always had the Harley tick but it has quieted it all down. Just my opinion though..
Liqui Moly is fantastic oil. It's a pretty fair price for me, so I always run it and have had great oil analysis when using it.
I use Amsoil in all three, but I use their VTwin kit for my M8. Different trans, primary and engine oils.
I was absolutely amazed at how much smoother and more responsive the bike was.
Ams oil, yes it's overpriced but it is the best and going from stock HD fluids in the primary and tranny it does shift noticeably quieter and it's much easier to find neutral
I use Amsoil for all 3 and ride a 2008 H-D Softail Crossbones
I use [this for crankcase oil](https://www.amsoil.com/p/amsoil-20w-50-synthetic-v-twin-oil-change-kit--4-quarts-with-chrome-filter-hdck/) - now 4quarts = 1 gallon so there's a bit extra in this but it also comes with an oil filter.
I run amsoil. They have specific oil for all 3 holes. Seems to quiet down transmission and primary on my 01 road king
I run Amsoil signature with an amsoil or wix filter, I usually only do 3k intervals to keep the 257 happy though lol.
One step above “full synthetic” is “100% synthetic” from Amsoil. Switched years ago, car has a subtle purr.
Liquimoly molygen 5w40 doing great in my 313k motor.
For those who aren't certain about which oil to use, I've read that the "fully synthetic" oil in the USA really isn't fully synthetic and the Liquid Moly stuff from ECS tuning might be a notch or two better than the Mobile 1 from WalMart*.
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