Depends on which differential you have but in most cases 4 to 5 pints should fill it.
Usually you fill it to the bottom of the hole.
till it comes out of the fill hole about a quart
3 1/2 pints should fill it.
Fill to the bottom of the "fill hole". When the fluid starts to drip out of the hole that you are filling in the diff, then you are full.
5 quarts
A 2011 LS sedan has a 12 US gallon fuel tank capacity.
how much oil do i need and what kind
SAE 75W90 synthetic gear oil
Aprox 4 pints in the rear differential.
In a 1997 Ford Aerostar ( REAR differential ) With the 7.5 " ring gear ( 3.5 U.S. pints ) With the 8.8 " ring gear ( 5.0 ) * traction lok , add 4 ounces of friction modifier
The fill hole is located about half way up the rear differential, fill it to where you put the fluid in, there is no way to get any more oil into it then that and it will be at the right level, you can also drain it into a measuring cup to see the exact fill the factory put in.
there is usually a bolt on the inspection plate of the diff and you fill up to the hole where the bolt is.