Engine oil MOTUL or AMSOIL

Motul 8100 x-clean 5W40 seems to be the sweet spot, all of my friends drive it in EA113/EA888 engines.

I use Amsoil 0W-20 508/509.

Other Euro brands such as Castrol or Motul are also fine choices

I used Motul and it made shifting noticeably better

I used the Kawasaki 10w-40 for the first year I rode mine, it would always have an odd mis shift here and there. Last year I used Motul 7100 and it made a huge difference, way less shifting issues

If you are considering an oil additive, best practice is to instead use higher quality oil (I like motul) and select one which matches your use case.

I run Amsoil in both of mine. Also use all their gear oil and transmission fluid

I run 5w-40 in my veloster (2012 w/ 140k miles). An engine with that many miles has greater parts tolerance than it did when new.

I personally am a big fan of Amsoil of Motul 300v.

AmsOil signature 0w30. It exceeds the factory spec.