As some of you guys might already know, E85 reacts differently with oil than standard pump gas and will break the oil down down faster.
My tuner advised me to change my oil a lot more often to prevent issues and is recommending Amsoil synthetic after break in.
I did a little reading and Mobil recommends trying Mobil 1 Turbo Diesel Truck 5W-40 as it is based on HD diesel technology, which contains additional over-based detergents for acid neutralization. ASK MOBIL
For those of you that have been running E85, what oil are you using and are you having any issues?