Since many of us choose to supercharge the 5.0 (2011-2013), and knowing that the Shelbys GT 500 use synthetic 5W50 motor oil, the question is are we suppose to also go from the recommended 5W20 to 5W50 after installing a supercharger on a 5.0?

 

No. Oil choice is for the engine design not the fact it's SC or NA

 

If you updated the car to 2013 internals you could run 5W-50 (2013 track pack specs). Running thicker oil will effect the operation of the oil squirters and high RPM characteristics. With the stock 2011-2012 pistons its not something most people would chance.

 

Plenty of us running Amsoil 10w-30. The track pack cars call for 5w-50 because of what Ford deems the intended use of the car. There is no difference in motors between the track pack cars and the non track pack cars.
http://www.svtperformance.com/forums...akes-5w50.html
http://www.svtperformance.com/forums...ies-10w30.html

 

When you increase power, you increase heat and pressure on the bearings. I wouldn't use 5w20 in a stock 4.6, much less a 5.0L v8 making 100 more horses. 5w30 or 10w30 full synthetic with a bottle of zddp plus thrown in for good measure. Your bearings will thank you. If you care more about your catalytic converter than your engine, then don't add zddp to your oil.


The shelby has forged pistons, which is part of the reason for 5w50.

 

So I'm going to ask the same question in a different way. I'm planning to buy a Shelby in a couple of months so what's going to happen if I choose to change the oil from 5W50 to 5W30 or 10W30?

 

the shelby is not just a 5.0 with a supercharger slapped on. it's a different engine entirely.

what are you digging at, what are you really wanting to know?

 

2011 5.0, any recommendations on oil? I was told to put in Valvoline 5/20 maxlife....that be okay?

 

There are certainly better oils out there. Is your car used during the Winter?
Again many of us using Amsoil 10w-30 with no problems. It will protect better than any of the 5w-20 oils out there.