Ford says don't modify your 2011-2012 Mustang 5.0 or your warranty is void

[fdkirkland]

[05mustangman]

Very interesting. Especially the part that says the engine is just about maxed out structurally from the factory.

[Jacostang]

Yup, those custom tunes are reaking havoc on the #8 cylinders.. I have the FRP Tune only in my 11...

[BurnTire]

#8 only doesn't pass the smell test for me. 1 to 7 are fine and only #8 fails.

[Rick Shopmier]

Picked up a new F-150 4x4 yesterday with the 5.0. It feels quicker and sounds much better than my 09 5.4, and was thinking of doing a tune on it, guess I will hold off. Will this heat ever end??????? Come on 9/9!!!!!!

[JoeT]

Thanks for posting this I missed this. Now you've helped me make up my mind 100% I do not want a 5.0 anymore. One wrong mod and your motor blows up. No thanks!

[svtrichie]

Dave, how do you like fro ford racing tune? These issues makes me want to get a shelby over the 5.0 even more.

[JoeT]

[Rick Shopmier]

I think all mfgr are trying to get around wty repairs if there is any reason. Posted some time ago there was an article about some guy (not around here) that had come to the dealer for wty repair on a new Mustang (05 on) with a damaged engine the dealer refuesed the repair under wty because the service manager witnessed the failure at a drag strip. There is fine print somewhere that say, racing a no no. As for the 5.0, this is still a new item and is in the figuring out phase, and if you look at the BOSS, for a 30 or so hp gain they literally changed everything except the block, but you have to think that the engineers are not going to design an engine in the begining of its cycle to be maxed for output, I think they are also working on higher output from the 5.0 design. I sure would not be throwing forced induction on one of these now! Time will tell.

[Wharf Rat]

That really ain't anything new.

Do a cai/tune, headers, ect on any car from any manufacturer and blow your engine and it won't be covered under warrantee. It's a calculated risk you take when you modify a car under warrantee.

The lifespan on the warrantees on my Mustangs have typically been about 2 weeks or 500 miles.