I run Amsoil and my oil change interval is 25k so the answer is it depends.
I only use Amsoil Signature Series in my B58.
I changed to that and really happy with it so far, shifting is butter smooth.
Based on my own tests, I found the AmsOil to be the best at reducing heat a few degrees. It's not cheap, but it's still cheap insurance, all things considered.
I use Amsoil 20w50 in all 3. You don’t need a different oil for the trans. Amsoil is not cheap but I’ve been using it on my 03 FatBoy since new and have had no problems.
I use 5w30, I used to use Schaeffer but it's too expensive now so I switched to Rotella.
Originally switched to Amsoil for the Noack rating but stayed because it's just good stuff. I now run Amsoil products for all fluids in all vehicles.
I use AMSOIL 5W-30 for both of our vehicles. Never had any issues on either vehicle using AMSOIL.
I think factory recommendation is Rotella but honestly you can go with any high quality oil. I have used Rotella, Castrol, and Valvoline synthetics in my 500 and I honestly don’t think it matters.
I am not hating on Amsoil. I am running their engine oil and ****ing hate it. burned off another quarter of a quart in the last day of driving... ive never had this kind of consumption before and there are no leaks...
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