Oil Spec For Performance Pack Cars.
 

Does anyone know if the viscosity spec for performance pack 15-17's is still
5W-50 like the 2014 Track Pack cars? I have a few cases of Mobil One 5W-50 on hand and I'm going to trade my 2014 for a 2018 so it would be nice if I could use the oil in the new car.

edit

Call Ford direct. Get the correct answer the first time.

Manual states 5W20 for all models of the Mustang and makes no differentiation between non track pack and track pack equipped cars.

Oh Well, I guess I'm stuck with 4 cases of Mobil One 5W-50. That's what i get for stocking up. Lesson learned.

Return the oil and swap it out for what you need. Most suppliers will take it back as long as the containers are not opened.

The '13-'14 5.0 is identical whether the car has the Track Pack or not (other than the Track Pack cars being equipped with the oil cooler and therefore requiring another half a quart of oil).
So that makes me think the newer 5.0 would be just fine whether you use 5w20 or 5w50 in it.
I'd just keep the 5w50 you have and just use it in the new car.

Only reason not to use 5w50 is gas mileage, no?

Actually , the 5W20 is for mileage, The 5W50 is more resistant to loss of viscosity at higher temperatures - namely track use.

It might be worth a shot but I'd guess NAPA wouldn't want 5W50 back as it is probably pretty hard to get rid of whereas the 5W20 is used in a lot of motors theses days. I guess it doesn't hurt to ask.

5w50 was recommended in the track pack cars because of track use assumptions. There was 0 difference in the engines on a TP and nonTP car. that being said if you live in a warmer climate you can run the 5w50 especially if you boost it or run hard a lot of the time.

The difference between TP and non TP cars in terms of engine were that TP cars came with:
1) Larger Boss radiator
2) Oil Cooler.

That second one is significant as 5W-50 will take more heat away from the engine because it's thicker. Higher film strength, sticks better to hot parts, etc.

And PP cars have the same radiator size and oil cooler.