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.
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.
Amsoil Signature 5w-20 + K&N Gold oil filter (HP1017 for 4th gens, not sure about 5th) is arguably the single best combo if you can afford the oil. Your lobes will thank you.
The first thing I did was change the oil using a wix filter and Amsoil signature series 5w30. The verdict is that the oil has plenty of life left and could have easily run longer.
Amsoil W20 I got a 5.7 it’s been great to me
Amsoil Signature Series 0w40 is an outstanding oil I run it with the SRT filter.
I did have a 1982 diesel Jetta go 435,000 miles on oem int. shaft bearings. I had access to a lot of free Amsoil back then....so, that may have helped. However, I think it over-lubed the cylinder walls though. Rings weren't exactly what you would call 'tight.'
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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