Wow that's weird
The theory now is that since no oil squirters, no need for the thinner oil. The boss and shelby take it. That 5w50 shit aint cheap either. $100 oil change for the shelby at ford. I know, I had one.
Possible, or it could just be a Boss oil cap. In any event I wouldn't use Ford's recommendation, be it 5w20 or 5w50.
Deysha stated on another forum that only the track pack and boss models are noted to run 50 instead of 20; her reasoning was because of the more enthusiast-like 'uses' of the vehicle. (running the motor harder)
Read more here: Ford 5w-20 vs. 5w-30 info: TSB 01-4-7(2001) - Ford Mustang Forums
...and there you have it. Straight from Ford.
Use 5w-20 if you care about mpg
Use 5w-50 if you care about your engine.
$100 says 90% of 5.0 owners now switch to 5w-50.
Thanks a lot, Ford...2 years after the engine's release and we now finally know what the proper oil is for the engine if we want longevity. Guess the owners manual is garbage. :rollseyes
Sometimes I wonder whether folks bother reading the current posts before popping in with a new post.
There seems to be info that would suggest 5w-50 is okay for the 2013 GT, as least from a warranty standpoint, since the 2013 GT and the 2013 GT Track Pack are mechanically identical. However, Ford has said/done nothing that would indicate it is okay for the 2011 or 2012 GTs. Since there are minor changes to the engine for 2013 (like the oil squirters, as SicShelby09 said), we will probably never really get a definitive answer from Ford.
This says nothing about the validity of UNLEASHBEAST's argument; however, it's more about what Ford can claim in the event of an engine failure and less about what's actually best for the engine.
Except the 13' GT500 also has piston cooling jets and calls for 5W-50...your move ;-)
Except the 13' GT500 also has piston cooling jets and calls for 5W-50...your move ;-)