Here's all the halfway decent info I could find on here. You might want to pm some of the folks who said they were running it.
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Originally Posted by Hector313
I just changed by diff oil this weekend. I used Royal Purple 75-140. I also used thread sealer. I bought three quarts of the gear oil and was able to pour them all in with out the use of a pump or suction device. The small amount that was left in each bottle (which was about one forth of the bottle) that I couldn’t get into the diff because of the angle and lack of space. I simply set aside and combined them at the end to “refill” my last bottle. With this refilled last bottle, I was able to top of the level with no problem. It was very easy to do. What took the longest was taking the time to clean off the threads on the drain and fill plugs to prepare them for the thread sealer. The Royal Purple cost me about $9 at NAPA per quart. The total job was less then $30 bucks. The Royal Purple has an extremely high Moly content that actually stays in suspension. Molybdenum actually bonds to the metal making a microscopically smooth surface. Smoother means less friction which means more ponies and less fuel consumption. I watched a Hot Rod magazine program on the TV recently that actually converted all of the lubricants in a vehicle to the RP. Dyno tests proved the increase in horsepower.
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75W-140 gear oil
Royal Purple Motor Oil
What type/grade of oil do you guys run in your Titan