I am about to change the rear differential fluid on my 2016 Silverado. I went to the dealer to get the fluid (75W-85 special new fluid, supposedly "High Efficiency"). The dealer was unable to give me the volume spec for the fluid to fill it back up. I have seen both 2 liters and 2.6 liters required. Seeing as to how the fluid costs $22 a liter from the dealer, I don't want to buy 3 liters if I only need 2.
Can anyone help clear this up/set me straight???