Engine oil AMSOIL or IDEMITSU

I use Amsoil 0W-20 508/509.

Idemitsu to both, because it’s designed and tested on rotaries.

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 use idemitsu rotary 20w50

I stick to Idemitsu. I have a Sohn adapter fitted, so it's 10-30 Idemitsu in the engine, twice a year and Idemitsu Premix in the Sohn adapter and in the fuel tank.

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

AmsOil signature 0w30. It exceeds the factory spec.

Amsoil ????

I only run Amsoil in everything I own from cars to lawnmowers. I use their signature series, but with the 0W-16 they only have their regular blend.