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.
My 2006 WRX has 323k on Castrol 10w-30.
I run Castrol GTX conventional oil in my 1972 Chevy C10 (350). I also ran that in a 1976 BMW 2002 I had in the 80s.
Also my main purpose is for wear protection and high temp protection etc which the regular line does exceptionally well
Regardless, I haven't heard of Aral, but I wouldn't knock it without proof that's worse than Castrol.
Mine eats Castrol Syntec 5w40 like it's going out of style as well.
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