What Weight Oil Do I Use In My Harley Transmission?
What Weight Oil Do I Use In My Harley Transmission? The optimum product would be Mobil 1 RacingTM 4T 10W-40 motorcycle oil, but it is also okay to use Mobil 1TM V-Twin 20W-50. What kind of oil goes in a Harley-Davidson transmission? Is there any problem with this? Our answer: It is perfectly acceptable to