Best Gear Oil for 2016 Harley Davidson Transmission Nosotros hope yous dear the products nosotros recommend and but so you know that every bit an Amazon Acquaintance & J&P Cycles affiliate, MyEngineNeeds may earn from qualifying purchases. What are the All-time 3 Transmission oils for my Harley Davidson? This is perchance 1 of the most mutual, and controversial questions asked by all Harley owners. It is not surprising because there are so many tranny oils to choose from, and you aren't certain which is safe for your ride. But you want the best oil that can reduce the accumulated engine heat. This is required considering the Harley Davidson is an air cooled motorbike that gets hotter quicker than a water cooled motorcycles. It is the right oil that helps ensure your Harley's motor runs at optimal temperature. Most important, you should know that y'all should never employ motor oil for your engine and yo