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 Mobil1 ESP 0W-30 personally
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.
Mobile 1 syn. doesn’t burn any yet. Never had issues with it.
Mobil 1 5w30 Annual advanced synthetic. We have a garage full of Mustangs heavily modified...all on Mobil 1 full synthetic...always. No engine, turbo, or supercharger issues on these cars as well.
Mobil 1 with no issues change every 3k, rarely top off in between changes
I put Mobile1 0w-40 in mine, even though it's not vw certified
I'm not a fan of Mobil 1. I have noticed my car burns only on Mobil 1.
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