Best oil for a T45?

[BMAC96GT]

I've read mixed reviews about oil for the T45 tranny. Some say that the T45s hate synthetic, some say thats all you should run.

I was planning on going with Redline MT-90.

Any suggestions?

 

[96blak54]

The highest most expensive fluid with the best review. Royal purple is really nice. B&M trick shift (used to be) nice. Not sure if its still available