Engine oil Shell or AMSOIL

I have maybe 60k miles on rotella t6 in various liquid cooled metric bikes. It meets the standards that yamaha requires and is way more available than yamalube.

I have used full synthetic Rotella T in my bikes for the last decade with no issues.

I recently switched from Liqui Moly to Amsoil recently, my wife's Tiguan seems to run a little smoother and is noticeably quieter at idle with the 5-40 European car formula.

My 93 loved and my 94 loves Rotella T6 5w40????????

Amsoil is just an above average full synthetic oil. It's nothing magical. It has a higher than normal "Total Base Number", which is what allows it to go longer between changes without going acidic.

For the FA20, I like Rotella T6 Multi Vehicle 5w-30.

Engine runs super smooth with that oil.

I use rotella 5-40 in mine. It's really cheap for a full synthetic and I saw less oil consumption after switching. It's intended for diesel engines but I haven't seen any negative effects after using it for 60k miles. I usually change it around 4k miles.

I use Rotella 10-40w Diesel oil. works great.

I use Amsoil 0w40 or Eneos 0w50 in mine. For sealing and shear resistance for metal to metal contact, thicker is better.

I used Shell Rotella T6 5w-40 for a while (not cat AND Sohn installed) and it was fine.