Mobil Delvac 1 75W-90

[dougsram]

From my online research (very encouraging), this is quality gear oil. Doesn't have the anti-slip additive that comes in the Mobil 1 and Valvoline gear oil. Not required (or desired) for my 11.5" anti-spin rear end. $46 a gallon from Amazon and no tax or shipping. Only very small amount of metal paste on my fill plug using this every 15-20k miles of almost entirely towing. Even Amsoil's unbiased testing against other gear oils shows Delvac coming in a close second. For less than half the price.