On Sale Now! Save 6% on the Lucas Oil 10146 Synthetic 50WT Transmission Lubricant - 1 Gallon by Lucas Oil at Specs About Car. MPN: 10146. Hurry! Limited time offer. Offer valid only while supplies last. Lucas Synthetic 50 WT Transmission Oil is designed especially for heavy duty truck transmissions but can be used in many other applications. Common gear oils are mostly base stocks with little more than an addition of sulphur and phosphorus as a total anti-wear package. Lucas Oil Products consider this inadequate. Most heavy duty truck transmission manufacturers now consider sulphur and phosphorus to be potentially corrosive to copper and brass and consequently recommend against common gear oils
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