I run Amsoil and my oil change interval is 25k so the answer is it depends.
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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.
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.
200K on the Altima with AMSOIL CVT, 150K on the Rogue with AMSOIL CVT and wait for it....140K on the Pathfinder with AMSOIL CVT.
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.'
im actually running that oil right now... I hate it tbh. 3,100 on the oil and it has allowed excess engine noise since day one, SUPER harsh cold starts, and now its burning through faster than the catrol I ran when I first got the car. a WHOLE QUART over 750 miles. the oil is thinner than piss going in, and it just doesnt stand up to what my engine can put out like Shell Rotella T6 has been doing...
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