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Joe’s Racing says it has customers that have found running lightweight gear oil in the hubs versus the more standard practice of packing it with grease can free up 6 to 8 horsepower. Joe’s recommends between 4 to 7 ounces of 85- or 90-weight gear oil. The easily removable seals make it easy to inspect your hubs weekly to get the maximum performance. You can’t see it in this photo, but each hub comes with an easy to reach fill hole. Just spin the hub until it is on top, pour in your gear oil and thread the plug back into place.