Proper lubrication is critical to the longevity and performance of your expensive Harley-Davidson engine and transmission. Don’t let your V-twin seize up or your transmission fail due to poor quality lubricants. J&P carries the finest Harley-Davidson gear oil and Harley transmission oil (including synthetics) from brands you can trust like Bel-Ray, Motol, Silkolene, Maxima, and Lucas.