Can you use 20-50w oil in a 1997 harley Davidson 5 speed transmission?
It is generally not recommended to use 20W-50 oil in motorcycle transmissions unless that is what is specified in the owner's manual. Most Harley-Davidson motorcycles, including the 1997 models, require a motor oil formulated specifically for motorcycles, such as SAE 20W-50 or SAE 25W-50. Using the wrong oil can lead to transmission problems and shorten the life of your motorcycle's transmission.