When you buy a stock mustang would it have an axle back configuration??
It's okay, but pointless. The only additives you need in the oil have been added by the oil manufacturer. I know a lot of people feel otherwise, but I have yet to see any independent study that can prove any of the claims made by the various companies that sell oil additives. Just use the oil recommended by the vehicle manufacturer. You won't find any manufacturer recommending any oil additives. In my opinion oil additives are just another way to separate you from your money. I've never used additives and never had a problem.
That's the devils playground. No car manufacturer recomends them. No service manual suggests them. The only people who tout them are the makers and folks who have spent their hard earned money and feel a need to defend them. There is no miracle or mechanic in a can. In a word -NO-
oil additives are for people who doesnt want to change their oil hence make no sense change your oil every 3000 kilo and your engine will love you for that additives mean adding money to someones pocket while damaging yours
Axle back generally refers to an aftermarket exhaust system. 2005-09 Mustangs have the muffler mounted at the rear, just ahead of the bumper, so I guess you would call the stock exhaust axle back.
