Hmmmm around 2.7pints for the front, 4.75 pints for the rear. However did you change the diff covers with aftermarket? That would change the quantity some. Ordinarily you fill till it comes out the filler plug. As far as what type... I would love to hear what others use. I offroad my jeep and use Redline, to resist the shock induced by off roading.... my 2 cents.