Hey guys. Looking at picking up a 2020 f150 5.0, but the previous owner clearly did some performance mods via roush. Looks like a performance pack 1 intake/ tune, and a borla cat back. The tune has me worried and I didn't find an answer searching. This truck was e85 compatible before the tune, does anyone know if you can still run e85 after the tune? Roush says the tune is "optomized for 91 octane" but doesnt say anything about flex fuel. Also, anyone know if this tune voids the factory warranty? Or does Roush have one of those special deals where their tune is ok with the OEM? Thanks guys. Its a great truck just want to know what I'd be getting into if I pull the trigger.

-Nick

 

lot of what if's with your situation ... in theory you should be fine running E85 but who knows for sure what that tune will do. I would suggest going back to stock or going with a tuner you can get fully accurate answers for what will happen when you do certain things. Most tunes will void your warranty and even with the Rosch Supercharger there are many stipulations to keep you in warranty .. simple things like bigger tires can void that supercharger warranty so again its a lot of what if's.

I also have not seen many people on this forum with Rosch tunes.. but you might get more info in the tuning forum

 

Was the truck purchased through Roush ?
Was the truck modded by an authorized dealership selling Roush products ?
If you can't answer these questions, walk away..
.