Engine oil OEM Toyota or AMSOIL

I’ve run amsoil in all my bikes and still do. Same with all my cars and trucks. Never had issues

For me amsoil signature series 0w20 a lot better than ravenol ehs 0w20.

I'm regularly using amsoil ss on my Honda L15z1 engine almost 7 years.

0W-20 Amsoil Signature Series 100% synthetic oil changed every 5k miles. Wix 57173XP filter.

I change mine every 5k irregardless of whatever Toyota says. Oil changes are cheap insurance to your engine if you intend to keep it for the long term.

As an avid user of AMSOIL, it’s a noticeable difference, amsoil is the king

With Amsoil even if it's not signature series I trust it more than any other 0w8.

I run Amsoil and my oil change interval is 25k so the answer is it depends.

I only use Amsoil Signature Series in my B58.

its really only an issue on track if youre running sticky tires. running 0.5-1.0qt overfill seems to be a decent solution on track

I don't recommend toyota oem fluid for hard driving because it seems to cook easily.