Spectro Performance Oils R.HDFOE Heavy Duty Fork Oil (Type E SAE 20, 1 Quart) Superior damping and long-lasting lubrication Anti-foaming, anti-rust, and anti-corrosion attributes Provides exceptional temperature stability Preserves and conditions your fork seals Heavy SAE 40 Limits front end Dive during braking. Exceeds all known OEM and Harley Davidson warranty requirements